Tach reading too high on El Camino

[HAFROD]

I just installed the round gauges from sweep this weekend. My tach is probably 800 to 1000 to high. I did install the filter on the firewall. I did a search here and see a few on Pontiac and Olds but nothing on Chevy tachs. What's the fix?

 

[pontiacgp]

There is a switch on the back to set it for an 8 or a 6 cylinder. If it's set for the right it could be a loose connection and Mark (Bonnewagon) can fill you in on how to fix that.

 

[O. D. Showtime]

No switch on the Chevy tach....some say the filter is not necessary but I'd use it. Here's some info I found...

The tach filter is exactly what its name indicates. It filters the high frequency interference generated by the solid state HEI so the tach sees only the firing pulses and not the interference. You can run without it, and if your HEI is elecrtically clean enough, you won't notice the difference. If you have electrically sloppy parts in the HEI, the interference they generate might cause the tach reading to fluctuate, but it still should be usable.

Tachs were available with the V6 is it possible you may have a V6 tach.

Most of the V8 tachs I've seen/sold had the redline at about 4700 rpm..

 

[O. D. Showtime]

I'm sure they can be re-calibrated...let me see if I can dig up some info...

**Okay I thought I remembered reading something on it once..

http://www.elcaminocentral.com/showthread.php?t=51305&highlight=tach+calibration

 

[SoFloG]

I think I'm dealing with a similar issue, my tach seems a few hundred rims high. Its a sbc in a cutlass that has the rallye pack and factory v8. Every other gauge appears to be functioning properl. Would a filter solve this?

 

[Rocket under glass]

I just installed the round gauges from sweep this weekend. My tach is probably 800 to 1000 to high. I did install the filter on the firewall. I did a search here and see a few on Pontiac and Olds but nothing on Chevy tachs. What's the fix?

What did you do to solve this problem my malibu is doing the same thing