Sup all,

Still having some trouble with my tach pegging out. I have semi-fresh distributor that came with the engine I bought. I transfered my new internals to it's case.

Now I have a strange problem. The tach wasn't working before either. Well, not very accurately, before it would be at 3k at idle and jumpy. With this engine and dist, it goes straight fully around, OVER 9000!

When I disconnect the tach wire on the dist, it falls down to nothing. I checked continuity and this wire is not continuous with ground. When I plug it in, it goes all the way up (key on, car on). When it's off, it's at 0.

When I checked voltages with the dist cap cover off, the tach wire lead on the dist checks to be continuous with ground. Strange? The other 2 leads in there are also looking to be continuous with ground. With the key in on position, I think they all get 12v.

The tach filter on the tach wire is roughed up, but it still has continuity across it.

What should I be looking for voltage wise? The car idles fine says my timing light. I don't have a dwell meter.

Left side is "tach", middle is idk, right is "12v".

CC-Carb. ECM run advance.

 

Bump bump in the rump.

 

same thing happens in my 83 camaro...it started happening wen i swaped out the cluster 2 a newer one...idk how 2 fix bit there is sum posts out there...

 

I've searched numerous times. All of them refer back to the 90-92 fix or don't answer the question. This is the last gauge that is left not working.
I'm still on my original cluster.
One thing to note, if the car starts stalling/sputtering, the needle goes down to the highest mark and jumps around there. When the car returns to normal idle, it goes back up all the way.

 

Hi all. first time post.
I've got the same problem. with the ignition on it goes to about 4000, once the car is started it goes flys right round to 9000 and sits there!
Its a 1984 T/A
any ideas?

cheers

Jonno

 

There's a capacitor on the back of the tach, I'll try that fix and report back.
Also bypassing the tach filter. I don't think it'll work, but it's a shot.
Also there's physically moving the needle back with the glass face removed.

Just need another break and I can give these a shot.