Tach doesn't work now

[BronzeOnSteelies]

I just put the guts of my dash back in a couple weeks ago and everything worked. Even the gas gauge that was a replacement did not need calibration.

Now I recently took one step backward.

On a recent drive the tach was "bouncing around and then stuck on 5500 rpm and stays there whether the car is running or not. The wires should be correct, I labeled them upper and lower tach wires when I took the cluster out.

Any thoughts or diagnosis. Say it isn't fried please.

Mark

[Charger_Fan]

If the needle stays on 5500 with the car running or not, I'd say it's probably fried...or at least tweaked real bad.

[BronzeOnSteelies]

I printed a post that was on this board that said a company named RT Engineering sold solid state "guts" for the tach.

I can't find the right company on an internet search. Anybody have their contact info and has anybody done this conversion?

[Plumcrazy]

I printed a post that was on this board that said a company named RT Engineering sold solid state "guts" for the tach.

I can't find the right company on an internet search. Anybody have their contact info and has anybody done this conversion?

http://rt-eng.com/mediawiki/index.php/Main_Page

[BronzeOnSteelies]

Thanks Plum

[BronzeOnSteelies]

You won't believe what was wrong with my tach, I am apparently an electro-mechanical genius.

I checked out the new circuit boards by R/T engineering and figured I would need one.

When I took my tach out the "wire arm" that goes out to the needle had been wrapped by a sticker a local company put on when they did a quartz movement install.  The sticker had their name address and number on it. Cut the sticker off and all is back to normal.