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Old 03-31-2014, 06:04 PM   #1
396man
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Join Date: Mar 2014
Location: Conneaut Lake PA
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Hi I'm new to the forum and I have sum questions..

Ok hopefully some one can help me figure my tachometer problems. I have a 1969 Chevy CST 20 with 396 and a factory tach. I just recently bought the truck and the tach only works "occasionally". I checked the wiring harness and all the connections are good. I cleaned where the brown wire goes on the coil and everything is clean and good. Sometimes I start the truck up and tach is working perfect and then driving down the road is starts reading incorrectly and quits. Any advice would be helpful.
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Old 03-31-2014, 06:59 PM   #2
undertaker72
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Re: Hi I'm new to the forum and I have sum questions..

welcome to the board , check for ground on inst cluster to dash , sounds like you have a intermittent ground problem
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Old 03-31-2014, 07:08 PM   #3
396man
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Re: Hi I'm new to the forum and I have sum questions..

Is there suppost to be a separate ground wire off the tach? The only wires on mine are the 2 wires that are in that "V" shaped connector.
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Old 03-31-2014, 07:24 PM   #4
undertaker72
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Re: Hi I'm new to the forum and I have sum questions..

the cluster usually grounds thru the dash , you can go to that ground stud and to a bracket for a better ground
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Old 03-31-2014, 07:38 PM   #5
396man
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Re: Hi I'm new to the forum and I have sum questions..

Thanks I really appreciate it. I'm new to working on these trucks so all the info I can get is a big help. I will try that and see if it helps.
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