Gauge Problems, Out Of Ideas

LRoak

New Member
Jan 2, 2013
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Hi, this is my first time posting. I've looked for the next step on the forums but I am out of ideas.

My engine temp guage just pegs to high whenever I hook it up. It worked last year before I tore into the restoration. It's a 65 coupe. Here is what I have done:

I first replaced the sending unit. Tried a few wires and got it working. Go forward a year and now it just pegs at high. I thought maybe there was a short in the wire and it was grounding somewhere along the way. I ran a new wire on the outside of the car and hooked it up. Same result. I thought maybe the voltage limiter was bad, because this is not my only cluster issue, so I replaced the limiter. Same result.

I then pulled a guage out of another 64 coupe to see if it was the guage itself. I got the same result with the other guage.
One thing to note, I thought I was supposed to be getting pulse current out of this limiter but it is just constant, is that the problem?
What can I try next? Any help would be appreciated. Thanks guys.
 
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Yes, I bought a new one for it.
I actually did try another old one from a different mustang but I got the same results and so I proceeded to buy the new one.
 
I am having kinda the same problem with my '66. The temp gauge works but oil, amps, and fuel do not. I checked the gauges with a test light and they have power but the test light goes dim then bright, over and over. I replaced the sending units and the wire loom on the engine. What else can I do?
 
Did you hook the ground strap back up that goes from the back of your engine to the frame? make sure its a good tight ground. You should also have a ground point behind the gauge panel to the framework under the dash - make sure it is tight too.
Do you have a digital multimeter so you can see the voltage you are getting at the gauge?