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Aftermarket tachometer wiring. 200

posted by  vrollvo on  Sat Jan 2 11:48 CST 2010
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last visit: Wed Oct 22 04:13 CST 2014
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I've checked FAQs and can't find anything on installing and aftermarket tach in the dash. So, I've got this cool old SUN tach, very close to large tach size.

All I've got to do is connect the trigger, the positive and ground to the correct pins, and it should work, no?

I can skip the internal light as the dash light will illume the face?

I'm tired of the bouncy Volvo tach. If the SUN bounces I'm putting the clock back in!








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    Aftermarket tachometer wiring. 200

    posted by  boxvolvo on  Sun Jan 3 01:20 CST 2010
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    last visit: Fri Oct 24 04:28 CST 2014
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    If you want to light the tach face it shouldn't be too difficult - splice in a wire from the dimmer rheostat switch connector, and it would dim with the rest of the panel.







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    Aftermarket tachometer wiring. 200

    posted by  244760 on  Sat Jan 2 12:13 CST 2010
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    last visit: Fri Feb 26 10:10 CST 2010
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    Does your cool old Sun tach have a switch that selects 4,6,8 cylinders?If it doesn't it's probably for a V8.


    Dan








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      Aftermarket tachometer wiring. 200

      posted by  vrollvo on  Sat Jan 2 14:10 CST 2010
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      last visit: Wed Oct 22 04:13 CST 2014
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      Yes, it switches 4-6-8, it's a Sun super tach II that I bought about thiry years ago, had it mounted in a '68 142S, threw it in a drawer until this week when I got the idea for a project.

      I'm taking it out of the plastic housing, making a plasic mounting plate for the back of the instrument cluster.

      I think all that needs connecting is the trigger, a 12v, and a ground, all of which are back there already. I can pull the + and - off the posts that the clock uses, and the trigger is white and red.

      Guess the worst that can happen is that it may get fried, but if it works I may never have to watch the ubiquitous freakish maddening bouncing needle again.








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        Aftermarket tachometer wiring. 200

        posted by  pageda on  Sat Jan 2 14:32 CST 2010
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        last visit: Fri Oct 24 13:18 CST 2014
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        If I understand you correctly you are going to re-use the back of the old tach (including electrical contacts to the cluster) to mount your new one? Then you should be able to get +12v for the tach and ground from the 3 prong connector for the small 52 mm clock on the back of the tach. The white/red wire is the signal from the coil.
        Dan








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          Aftermarket tachometer wiring. 200

          posted by  vrollvo on  Sun Jan 3 11:15 CST 2010
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          last visit: Wed Oct 22 04:13 CST 2014
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          Yes, i'm cutting out, using the clock back as a pattern, plastic to match. All screw holes will line up, and simply using the SUN's existing mounting screws to the back of my new plastic cover!

          Powered up from the existing + and - poles, and triggered with the red/white wire, lighted from above with existing dash lighting, should work like a wet dream. Using a scroll saw and eighth inch lucite plastic to glue up a sandwich of necessary thickness.

          A fun project at 15 below on the kitchen table using an extra instrument cluster to practice on. Why is it so cheap to have fun?








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    Aftermarket tachometer wiring. 200

    posted by  thecbdb on  Sat Jan 2 11:52 CST 2010
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    last visit: Tue Jun 22 12:17 CST 2010
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    All you connect is the red and white wire that comes from the + pole of the coil. That's it.
    --
    1985 244DL B230 M46 170k








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      Make that the - (minus) pole of the coil. (NMI) 200

      uid 18083's pic
      posted by  lucid on  Sun Jan 3 06:02 CST 2010
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      last visit: Fri Oct 24 12:31 CST 2014
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        Make that the - (minus) pole of the coil. (NMI) 200

        posted by  thecbdb on  Sun Jan 3 08:48 CST 2010
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        last visit: Tue Jun 22 12:17 CST 2010
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        I had to go look...and I'll be damned, you're right.

        In any case, the red/white wire should be spliced into the spade connector on the coil already, so just find the other end of it loose behind the instrument panel. On my car, it was bundled with the main harness to the inst. panel.

        Charlie
        --
        1985 244DL B230 M46 170k







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