240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

Wiring the Tach

Old 11-10-2007, 04:09 PM
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Wiring the Tach

I know there is supposed to be an in-line resistor. Anyone know the Ohm's?
Thanks.
Running after-market Mallory dizzy, and a Blaster II coil, with MSD wires. If that makes any kind of difference. Not sure why it would.
Interestingly enough, I can't find a good wiring schematic to save my life, and they don't show gauge wiring.

Did a search, I figured it was mentioned before, but I probably overlooked a mention of the ohm's.
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Old 11-11-2007, 04:49 PM
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u running a stock tach or aftermarket?
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Old 11-11-2007, 05:02 PM
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Factory.
I have an after-market one, but would rather run stock.
Plus, every after-market one I bought had directions. haha
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Old 11-11-2007, 06:29 PM
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stock ones do have a resistor. a big debate ons different year tachs. quote unquote 280z tachs are suppose to be more accurate. but should be a illumination wire,power wire,ground wire and sender wire that goes on the - of the coil.
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Old 11-11-2007, 10:00 PM
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Cool.

Any word on what resistance they use???
I can go down to Radio shack, and pick on up, or several and run them in parallel or series to make the correct resistance. Just need a number to go on.

Thanks so far.
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Old 11-12-2007, 12:09 AM
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http://forums.hybridz.org/showthread...ght=stock+tach

ballast resistor is what i was referring to.
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Old 11-12-2007, 12:54 AM
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Thanks for the thread.

But, let me make this more clear maybe. Could be a communication issue on my side.
All the wires in this car were stripped out. They were all cut out for some reason by the previous owner that I couldn't begin to comprehend.
But, things like resistors are gone.
So, I do NOT have the resistor, and need to find a replacement.
Anyone ever take the resistor out and check the ohm's???
Otherwise, from what I can tell, people have run them straight to the coil.
But, I imagine this would cause false tach readings in the best case scenario.
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Old 11-12-2007, 10:01 AM
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im sure it will give u false readings if u dont have that resistor. it would almost pay off to get a aftermarket gauge.
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Old 11-12-2007, 10:47 AM
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I don't want an after-market one. I have two I could put in, but I don't want them in this car. Not unless I change all the gauges to match. Don't feel like that right now.

If no one knows what the resistance is, I will go find another Z in a junk yard and rip it apart to find one. Talk about a pain in the *** though.
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Old 11-12-2007, 01:58 PM
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I think the resistor would be in the tach. The wires to the tach would be illumination from the dash lights, power from the hot side of the ignition and the "read" comes from the neg side of the coil. The after market coils should have a lead just for the tach because of the longer multi-spark. Try tech support at Summit Racing.
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Old 11-12-2007, 02:57 PM
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Okay, coils don't have extra leads. If I had an after-market ignition unit, like the MSD 6AL, they do. Have one on my truck.
Good to hear. I was under the assumption that the resistor was outside of the tach. But, to assume makes an *** out of u and me. haha
Thanks.
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