73-87 Chevy _ GMC Trucks > Instrumentation

87 v10 350 tbi tach going crazy

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buzzman351:
Hey guys, new here. I installed a aftermarket tachometer on my 87 350 tbi and when I turn the key the tach buzzes and jumps around 0 for a bit and same at initial startup then goes to the rpm it’s running. Any ideas

bd:
Some possibilities:  1) bad tach head, 2) where it's connected, 3) how it's connected, 4) poor ground.

buzzman351:
I’ve checked everything numerous times. It’s some sort of interference. I’m going to install a resistor on the signal wire

bd:
Tach Filter

buzzman351:
Yesir

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