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Thread: Tachometer Swap : 280z into a 240z series 1 housing

  1. #1
    Nova Scotia,Canada,Earth Blue's Avatar
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    Default Tachometer Swap : 280z into a 240z Series 1 Housing

    Comparison Photos:

    280z on left 240z on right

    Click image for larger version. 

Name:	001 280z tach face.jpg 
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ID:	56087Click image for larger version. 

Name:	002 240ztach face.jpg 
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    Front (note 280z screw hole)


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Name:	003 280z l 240z r.jpg 
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    Bottom


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Name:	004 280zl 240zr.jpg 
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ID:	56090
    Top


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Name:	005 280zl 240zr.jpg 
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ID:	56091
    Back


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Name:	007 280z back.jpg 
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ID:	56093 Click image for larger version. 

Name:	006 240z back.jpg 
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ID:	56092
    Back Harness (Note white current loop on 240z and red voltage pickup wire on 280z)


    Click image for larger version. 

Name:	008 280z power connections.jpg 
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    280z back (Green is 12V and black is ground)


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Name:	009 280z connections.jpg 
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ID:	56095Click image for larger version. 

Name:	010 240z connections.jpg 
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    280z and 240z connector comparison. (Note the different locations for Gnd and +12V. It is neat to see the location for the tach signal input is in the same part of the can...clever engineering and evolution).

    Last edited by Blue; 09-04-2012 at 05:05 AM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  2. #2
    Nova Scotia,Canada,Earth Blue's Avatar
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    Default 280z Tach Disassembly

    Disassembling the 280z donor tach


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Name:	011 280z bezel removed.jpg 
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ID:	56097
    Remove bezel, lens and trim pieces


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Name:	013 280zinner face.jpg 
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ID:	56099
    Front face


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Name:	012 280zneedle.jpg 
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ID:	56098
    Angle showing needle


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Name:	015 280z needle.jpg 
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ID:	56101
    Carefully pry off needle.


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Name:	016 280z faceplate screws removed.jpg 
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ID:	56102
    Remove two black screws holding face plate.


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Name:	017 280z guts.jpg 
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    280z "can" with tachometer workings fastened to bottom.


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Name:	014 280z circuit screws loose.jpg 
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ID:	56100
    Remove two screws in back and press on the brass studs to "push" workings out. There is a double sided foam tape also holding the workings so you may need to apply heat to soften it. Prying up by starting at the sensor post seemed to work best for me.


    Click image for larger version. 

Name:	018 280z workings.jpg 
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ID:	56104
    Removed.


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Name:	019 280z housing.jpg 
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    Empty 280z can.
    Last edited by Blue; 09-04-2012 at 05:06 AM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  3. #3
    Nova Scotia,Canada,Earth Blue's Avatar
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    Default Date Codes on Tachometers

    Date code stamps on the tachs:

    Click image for larger version. 

Name:	021 240z date Nov 23 1970.jpg 
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ID:	56106 Click image for larger version. 

Name:	022 280z date May 24 1977.jpg 
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    240z: 70-11-23 280z: 24-5-77
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  4. #4
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    Default Disassembling the 240z Tach

    Disassembling 240z Tach:

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Name:	020 240z induction removal.jpg 
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ID:	56108
    Remove pick-up current induction loop.


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Name:	023 240z connectors removed.jpg 
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ID:	56109
    Connectors removed.


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Name:	024 240z bezel.jpg 
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ID:	56110
    Remove bezel and lens and spacer.


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Name:	025 240zinner face.jpg 
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ID:	56111
    240z face.


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Name:	026 240z needle.jpg 
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ID:	56112
    Side view of needle.


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Name:	029 240z guts.jpg 
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ID:	56113
    Workings in the can. (note the white turn indicator hoods)


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Name:	030 240z inside.jpg 
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ID:	56114
    Workings removed.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  5. #5
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    Default Transplanting 280z guts into 240z tach

    The Swap:

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Name:	031 280z guts in 240z can.jpg 
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    280z "guts" in 240z tachometer.


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Name:	032 back of 240z with 280z guts.jpg 
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ID:	56116
    Align the posts on the back side. (match the holes to the white foam indentations)


    Click image for larger version. 

Name:	033 screws.jpg 
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ID:	56117
    The securing screws are different. Use the 280z ones.


    Click image for larger version. 

Name:	034 secured.jpg 
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ID:	56118
    Secured.


    Click image for larger version. 

Name:	035 connections.jpg 
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ID:	56119
    Different connectors. Use the 280z. (Burnish the brass fittings)


    Click image for larger version. 

Name:	036 280z connector on 240z.jpg 
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ID:	56120
    Installation detail. Star washers lock connector.


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Name:	037 face plate installed.jpg 
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ID:	56121
    Install face plate.


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Name:	038 240z wires connected.jpg 
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ID:	56122
    Install 240z harness to connector. (Black is ground)
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  6. #6
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    Default

    Button-Up



    Click image for larger version. 

Name:	039 Bezel dirt.jpg 
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ID:	56125
    240z "sand" inside the bezel. I think it may be from the paint inside.


    Click image for larger version. 

Name:	040 lens dirt.jpg 
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ID:	56126
    "Gravity grime" and dirt on the lens...especially at the bottom. (wash with soapy water and polish with plastic polish)


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Name:	041 needle installed.jpg 
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ID:	56127
    Installed front needle.


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Name:	042 glue.jpg 
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ID:	56128
    I used goop to secure it. I read a post saying NOT TO USE CRAZY GLUE.


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Name:	043 needle.jpg 
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ID:	56129
    Installed needle.


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Name:	044 installed bezel.jpg 
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ID:	56130
    Install the side screws.


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Name:	045 finished front.jpg 
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ID:	56131
    Done!


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Name:	046 finished back.jpg 
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ID:	56132
    Back of completed tach showing white loop, power connector, and red sense wire that will be soldered to a longer one that will be routed to the coil -neg terminal.


    Click image for larger version. 

Name:	047 280z dirt.jpg 
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ID:	56133
    Closing photo: Very dirty lens from 280z tach.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  7. #7
    Registered User Ptero's Avatar
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    Default

    '73 HLS30 143820

  8. #8
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    Default Removing Tach Needle

    Follow up.

    Tach works great.

    Here is a clever use of spoons I found on the net:

    Click image for larger version. 

Name:	file.php?1,file=153721,filename=Speedo_Fix_Small.jpg 
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ID:	56539


    How to remove the needle from a tachometer.
    Last edited by Blue; 10-15-2014 at 04:52 AM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  9. #9
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    Default

    Awesome discussion. I have a '73 that I put together from parts. It runs great but I too am trying to get the tach working. I upgraded to the Pertronix ignition. From the discussion above I understand where to connect a gnd and the +12volt wire, but I am confused as to how to hook up the "current loop" I bought a spare tach, was told it was working and was planning to "test wire" it under the hood before pulling the old one out of the dash. One side of the current loop has a piece of red tape and the other side has a piece of black tape. Where do I connect these two wire?
    Last edited by Burto; 10-14-2014 at 01:24 PM.

  10. #10
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    Default

    Hi Burto,

    The above really is for wiring a 280z. There are only 3 connections (Ground, +12V and the tach. signal from -neg coil)


    This may help with your '73 tach:

    https://www.google.ca/search?q=site%...m=122&ie=UTF-8
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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