I have a 98 ZR2.While driving down the road,my tach will jump around and then quit.When I stop and turn the key off,then restart :screwy: it,it works fine again.Ideas?

does it work properly every single time you restart the engine, or just every now and then?

So far everytime I restart the tach is fine.The tach only throws a fit once and awhile.

well i was gonna say maybe the wire is corroded(sp) or a ground is bad but with it working fine when you first start i don't really have a clue, maybe your cpu but i am not sure sorry man

maybe its a sign the alternater is going out in my cressida did same thing 2 weeks later the alternator stopped working, shucks does electrical testing for free!

Thanks I'll look into it.

Is this the only guage acting up?

I had a 94 full size Blazer K1500 and when my battery started going bad my speedo was jumpy. Along with my aftermarket tach.

Just the tach.The battery was dead a couple of times,so maybe I'll check that out too.Thanks.