tach problems

[mytoy]

I have a 78 L82 four speed, the problem when the car is at idle and running the tach is fine when I shut the car off the tach stays around 1000 , anybody got any ideas thanks mytoy

 

[TJay]

mytoy,
I can't help you solve this issue, but my 79 is the same way. I installed a new tach circuit board and it made no difference, so I live with it. Thats not to say a new board will not solve your issue, I'd just hate to see you spend the money for the same result like I did.
Good Luck

 

[KANE]

I have a 78 L82 four speed, the problem when the car is at idle and running the tach is fine when I shut the car off the tach stays around 1000 , anybody got any ideas thanks mytoy

I think they all do that once they get a certain age.

Doesn't seem to be a big deal- as soon as the key is twisted forward.. the tach assumes the ready position... the starter engages and then it roars to life!!!

 

[6880 Mike]

That's normal. The tach is electrical. It loses juice when you turn off the ignition but it ought to be down near the idle speed mark (600-800 rpm; check the tune up sticker). 1000 rpm for a curb idle seems high.