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.

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

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.

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

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.