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post #1 of (permalink) Old 04-04-2004, 01:00 PM
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Wiring Question ... Tach Filter???

Ok, a few days ago I mentioned a '77 project we've got now. It has a factory tach, but no harness. Since it's HEI and we've got a diagram we're making one, easy enough. My question is, on the diagram it shows something called a tach filter right after the distributor but before the firewall, I think. So, what is it?
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post #2 of (permalink) Old 04-04-2004, 07:57 PM
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Re: Wiring Question ... Tach Filter???

It's probably just a coil or capacitor to keep noise out of the radio. I don't use one with my "factory" tach.
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post #3 of (permalink) Old 04-05-2004, 01:37 AM
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Re: Wiring Question ... Tach Filter???

Ok, that was pretty much my guess, wasn't sure though. You're one of the lucky SOB's that has a tach instead of a 4" fuel gauge? Are you using the GM harness, or do you have it wired in differently? I think that if a manual tranny is in a truck it should come stock with a Tach. Why in the fawk would I want a 4" fuel gauge with a blank spot in the lower left of my cluster? I don't think the clock was a bad idea, so why don't all the automatics have a clock in the blank spot of the cluster? DAMN YOU GM... [img]images/graemlins/chair.gif[/img] I love my trucks but, what in the heck were they thinking...

Here are some of the ones I found on ebay:

Camaro:


Corvette:


Reproduction (universal):
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post #4 of (permalink) Old 04-05-2004, 08:12 AM
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Re: Wiring Question ... Tach Filter???

The clock is a $30something option. My truck came with one. I modified my cluster to fit a tach out of a Monte Carlo or something to fit in the big hole. Doing this, I lost the seatbelt light and the brake light. Oh well, I prefer to know where I'm shifting if I run through the gears manually.

Those ones you've got shown there are all coil-type filters. You can find the same-looking ones under the hood between the antenna and the wire to the radio.
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