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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | I did a quick search. The temp gauge is a voltmeter, it's reading the rise in voltage as the temp sender resistance goes down. I didn't see the resistance for a 60s truck, but the later trucks use about 1400 cold and 50 hot. You should have voltage at both sides if the gauge, and at the sender. If you momentarily short the sender wire you should see the gauge spike.
Larry
I don't own a vehicle that isn't old enough to drink.
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