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ANGUS
04-26-2009, 06:32 PM
Could someone give me pointers on how to test my tach. It typically works up to about 3000 then drops out completely, other times it is in and out all day at any speed. I don't know where to look for a bad connection...or is it the tach itself? 1992 454 King Cobra...seems fine under the dash. I question the tach but hate to just replace it without testing connections etc. Thanks for any tips. Angus:eek::confused:

fogducker III
04-26-2009, 06:50 PM
Just a thought...........have you checked that the "setting" on the back of the tach is correct? Not sure what type of tach you have but there should be a dial setting that should be for the V8......:confused:

Other than that sounds like a ground or the purple or grey (can't recall which colour for the 454) might be loose?

Pismo
04-26-2009, 08:02 PM
I had the same problem, the wires were reversed.

ANGUS
05-07-2009, 05:37 PM
Bad pin connection where the main wiring harness joins the engine...separated and cleaned pin and receiving plug...works fine. Thanks for helpful suggestions.:yes: