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65chevysub · 05-31-2021, 02:04 AM

I put in an aftermarket tach in my 84 Sierra, 350/TH400, but it doesn't work right. At idle it doesn't read, but as soon as I start to drive, it goes to 3500 rpm and stops there. I have it connected to the TACH terminal on the distributor. What can be causing it to do this?
Thanks

05-31-2021, 02:04 AM	#1
65chevysub Registered User Join Date: Feb 2013 Location: Cottonwood, Arizona Posts: 1,374	Aftermarket tech issue I put in an aftermarket tach in my 84 Sierra, 350/TH400, but it doesn't work right. At idle it doesn't read, but as soon as I start to drive, it goes to 3500 rpm and stops there. I have it connected to the TACH terminal on the distributor. What can be causing it to do this? Thanks