96 SE 5 speed

Out of no where my tachometer goes crazy at 2,600 RPMs. When I hit 2600 the needle jumps all over the place, like it is playing pinball. but as soon as I rev to 2700 RPMs or drop below 2600 everything returns to normal. It does not seem that anything else is affected.

It is not a big deal because it is not doing any harm but I was wondering if anyone has heard of this before and what caused it?

 

Something similar happened to me........... the RPM needle was going up and down......... the speed needle was at 120MPH when my car was parked.............. the ebrake light was on when I had my ebrake down....... it was a crazy thing............ I was all scare! the next morning I tryed to turn on my car and the batery was dead........ so I replaced my battery and everything came to normal now......

 

Dang me too..... same rpm and everything im giong to take mine apart to do an LED mod to it so im giong to look into it then but for now im living with it

 

Same thing was happening when I bought my car. When the RPM's reached 2500 it bounced all over the place but after the car reved past 3800 it went back to normal. I ended up buying a cluster on ebay and swapping out the tach. I haven't had a problem since.

 

Common problem it seems. (joins the club)

 

I'm just going to throw this on the table: It could be the alternator. I had a problem similar to this with my old 89 Ford pickup. We had to give another car a jump and my dad accidentally crossed the cables (bad eyesight). So stuff sparked and whatnot, and when it was all said and done I noticed that my tach went the opposite direction when I accelerated. We took it to the mechanic and he said something about 'reversed polarity' or something. This was maybe 2-3 years ago so I'm real fuzzy on the whole thing. Again, it's two different vehicles and two fairly different situations. It's a possibility though...

I'm could just be wayyy out there on another planet too, I'm extremely tired.