Quote:
Originally Posted by LockDoc
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There are two different sending units, one for the idiot lights and one for the gauges. I bet you have the wrong one. I can't tell you what the ohm readings should be but I would bet it's the sender..... Nice looking truck!
LockDoc
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The sender for the idiot lights is just a switch, normally open and closed if the temp is exceeded. If it is the wrong sender then it will just show open on the ohm meter during normal operation. I took a quick look at the part listed and it looks right. The one for the idiot light has a spade terminal and the one for the gauge has the round nub sticking out, you can see drawings on the LMC site, page 187.
Check the wire and make sure it is not damaged. Basically your temp gauge is an ohm meter, so anything affecting conductivity will make it read wrong. When I first got my 68 back together I was reading cold or barely registering. My wire had been cut and was twisted together and taped, when I fixed it with solder and heat shrink the problem was resolved.
-Richard