When we rebuilt the motor in our "69"chevelle this winter I also replaced the sending unit. With the new sending unit, the factory gauge reads 3/4 towards the hot when at full operating temp. With the old sending unit, the gauge always read 1/2 when at full operating temp. I have checked the the water temp with a mercury thermometer and it reads 192 degress, which seems to be about optimal to me. Does any one know if there is a way to add a resister or maybe change the sending unit to get the factory gauge to work correctly?

If you’re willing to trying a new sending unit Electric Limited (http://www.lectriclimited.com) claims to have temp senders with the correct res-vs-temp.

Crankitup,

Just did the same thing w/my 69. Used to read around 1/2, now reads hot. This burns me up (pun intended). The unit I used was an AC DELCO from NPD. I went to Autozone, and they have a replacment, but the connection was like a spade(?) rather than the little round nub. I don't wanna cut my factory wire to try the new one.

BTW, does your car use the "slotted" connector? Mine does.

I had the same xact problem,,, bought a sender from the Clock Doc,,, problem cured, I think it was an electric limited, but not 100% positive, Clock Doc stocks them,,

Nick,

Is there a website for the clock Doc?

I found it thanks!

Colby, Vince, and Nick, I found good information from your suggestions. Thanks for the help!

Just searching the archives for some more information and came across this topic....I am having similar issues.

The correct sender is a button type but I am not sure what the proper connector is on the wiring harness?

Anyone have a picture?

Here's (http://www.chevelles.com/showroom/temptmpcon.jpg) a pic showing the temp senderwith a connector attached, a 2nd connector and the wire terminal used in the connector. This is correct for your 65, if that's what your working on.

Thank you very much. I really appreciate your help.

Not sure what I would do with out this site