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Thread: Easiest way to remove tacho from '72 240Z?

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    Registered Ign/ECU Nurse alhbln's Avatar
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    Default Easiest way to remove tacho from '72 240Z?

    I need to remove the four wire tacho for a conversion from inductive to +12v trigger as i am currently installing a megajolt ignition setup.
    What is the easiest way to remove the tacho from the dashboard, can i just remove the locking nuts on the back of the tacho from under the dashboard and then pull it out from the front?

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    Registered User zcar70's Avatar
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    Exactly. The tach and speedo remove from the front on 240Z dashes, unlike 260/280s that remove from the rear.

    The hard part will be getting access to the wire harness plug, light bulbs and wing nut that secures the rear of the tach. It can be done, but sometimes it is easier to remove the entire dash! Then you can clean the lenses and install newer, brighter instrument light bulbs too!

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    Registered Ign/ECU Nurse alhbln's Avatar
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    Great, thanks! I'll try to do this without removing the dash first, wish me luck.

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    NUTs according to wife ChrisZ's Avatar
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    Adrian, except if you have a dash cap, then you can't get it out the front.

    Chris
    -73 240Z HLS30-171039
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    Rust Free'ish zKars's Avatar
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    Those wing nuts are a beech to crack by hand. Take 3/8 drive, 7/16 6pt socket, and cut a slot down into to it with a dremel wheel, wide enough that would fit over the wings. Then use that over the wing nuts with a 1/4 drive handle and adapter to break the wing nuts free. Last resort, but it works.

    One of those tools we should have as a mail out loner like the spinder pin puller....

    Good luck. With strong fingers you can do it without.

    Jim

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    Registered User lonetreesteve's Avatar
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    Another way to loosen the wing nuts is to use one of those miniature crescent wrenches - it has worked well for me on a couple of cars.
    Steve

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    Registered Ign/ECU Nurse alhbln's Avatar
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    Thanks, it worked out as planned. Had to use pliers for the second wing nut, the first one was no problem. i pulled the bulbs from behind while tacho was still installed, then gently pulled out the tacho and removed the four wire connector from the front.

    Chris, on the '72 240Z you can just pull out the tacho in one piece without having to remove the dash, lucky me

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    1978 280Z (stock) TomoHawk's Avatar
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    Inmy 280Z, the tachometer has always been easily removed from the front. I'll have to try it the other way...
    Drive Responsibly.
    enjoy classic Rock music.

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    Former frequent poster sblake01's Avatar
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    Quote Originally Posted by zcar70
    Exactly. The tach and speedo remove from the front on 240Z dashes, unlike 260/280s that remove from the rear.
    Where do you get that info from? The couple of times I removed the tach from my 78 280Z, I pulled it from the front as per the factory service manual's instructions.
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    What Steve and Tomo said! I don't know how the 240's tach is removed, but I suspect it's the same way -- one screw at the top front of the bezel, and one on the lower side behind the tach.

    The dash cap is a bit of a pain, but with a bit of care, you can shoe-horn the tach past the cap with a thin, well-worn screwdriver that you slide around the outside of the tach.
    My last three sports cars while I still owned all three:

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    Registered User lubu's Avatar
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    Quote Originally Posted by sblake01 View Post
    Where do you get that info from? The couple of times I removed the tach from my 78 280Z, I pulled it from the front as per the factory service manual's instructions.
    Same here mine is a 260z and I removed from the front also. Virtually impossible to remove it from the back without removing the whole dash.

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    NUTs according to wife ChrisZ's Avatar
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    Quote Originally Posted by alhbln View Post
    Thanks, it worked out as planned. Had to use pliers for the second wing nut, the first one was no problem. i pulled the bulbs from behind while tacho was still installed, then gently pulled out the tacho and removed the four wire connector from the front.

    Chris, on the '72 240Z you can just pull out the tacho in one piece without having to remove the dash, lucky me
    Adrian, i have just read that you can't pull it out from the front, if you have a dash cap, do you have a dash cap?

    Cris
    -73 240Z HLS30-171039
    -66 Roadster SPL311-05204

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    Z geek at large FastWoman's Avatar
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    Just to be clear, I have a dash cap (a half cap). I pulled my tach on two occasions from the front. It took me a few min to carefully work the tach past the cap, but it can easily be done with a bit of care.
    My last three sports cars while I still owned all three:

    2001 BMW Z3 Roadster 3.0i soft/hard top (sold)
    1966 Ford Mustang Coupe (sold)
    1978 Datsun 280Z (enjoying very much )

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    1978 280Z (stock) TomoHawk's Avatar
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    If there's a way to get the tachometer and speedometer out past a full dash cap, I'd like to know!
    Drive Responsibly.
    enjoy classic Rock music.

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    Registered User 260zCaliCar's Avatar
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    Me too... I've tried without success.

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    1978 280Z (stock) TomoHawk's Avatar
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    Could you trim the dash cap so the speedometer could be removed, and have the edge look nice?
    Drive Responsibly.
    enjoy classic Rock music.

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    Quote Originally Posted by TomoHawk View Post
    If there's a way to get the tachometer and speedometer out past a full dash cap, I'd like to know!
    It can't be done with a full dash cap without damaging the cap. That's why the glove box and the heater control panel need to be removed in order to remove or install the tach and/or the speedometer from the rear.
    Steve

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    Registered Ign/ECU Nurse alhbln's Avatar
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    Quote Originally Posted by 2 fast 2 Z View Post
    Adrian, i have just read that you can't pull it out from the front, if you have a dash cap, do you have a dash cap?

    Cris
    No dash cap, just a standard 240Z with the original dash and instruments.

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    NUTs according to wife ChrisZ's Avatar
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    It makes sense
    -73 240Z HLS30-171039
    -66 Roadster SPL311-05204

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    Registered User tlorber's Avatar
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    I recently pulled my tach from the front-just the 2 wing nuts, which I loosened with lineman's pliers. There is enough wire length to disconnect the harness from the front hole after you pull it. Getting the nuts back on may be a bit more difficult.

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    Former frequent poster sblake01's Avatar
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    Quote Originally Posted by 2 fast 2 Z View Post
    It makes sense
    Chris, you got me with that insect emoticon crawling around your signature! I smacked the monitor a couple of times before I realized......
    Last edited by sblake01; 12-29-2009 at 06:37 PM.
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    NUTs according to wife ChrisZ's Avatar
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    Sorry, i hope your monitor survived.
    -73 240Z HLS30-171039
    -66 Roadster SPL311-05204

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