Hitman's Pontiac Trans Am Forum

Trans Am Information => Trans Am Tech => Electrical => Topic started by: Toolmaker1965 on October 21, 2017, 10:26:48 PM

Title: 1979 Trans AM Tach issue
Post by: Toolmaker1965 on October 21, 2017, 10:26:48 PM

Hi I recently bought a 79 trans am 403 with 71000 miles on it. I'm fixing the little things and one thing is the tach. At idle its sets at 4000rpm and goes to max 6000 when I'm driving. I have a wiring diagram and I've checked and all the wiring is correct. Any ideas?
Thanks in advance

Title: Re: 1979 Trans AM Tach issue
Post by: Wallington on October 22, 2017, 06:15:16 AM

It could be actually operating fine between 0 and 2000rpm but needle has been bumped or the fragile assembly inside touched. There's not a lot you can do without risking making it worse. They do sell new tachos by OER  although when last checked a few years ago 79 wasn't one of them. Perhaps now.

Title: Re: 1979 Trans AM Tach issue
Post by: Toolmaker1965 on October 29, 2017, 11:41:31 PM

OK thanks I will check them out.

Title: Re: 1979 Trans AM Tach issue
Post by: Toolmaker1965 on October 29, 2017, 11:53:34 PM

I just checked them out and your right 79 is not the year tach that they carry.  :( Thanks anyway.

Title: Re: 1979 Trans AM Tach issue
Post by: Wallington on October 30, 2017, 12:31:27 AM

That's ok, it's been a few years, thought they may have by now.