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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!
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#88722 02/11/2004 4:22 AM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | The late '47-early '51 GMCs used an electric temp gauge, rather than the Chevy-style capillary tube. Does this 6 volt gauge require a special sender, or does it use the same one as the post-'55 trucks? When converting to a 12 volt system, will it need a voltage reducer like the gas gauge?
Bonus question - Do the '55-'59 electric GMC temp gauges measure the same range as the '54-'55 capillary tube gauges? The later ones just said 'Hot' or 'Cold' rather than showing an actual temperature, and if they display the same range, I'm going to use the earlier decal.
GMCs, GMCs everywhere! | | |
#88723 02/13/2004 4:07 AM | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | An electric temperature sensor is a resistor going to ground. It shouldn't make any difference whether it is grounding 12 or 6 volts.
As it heats up it has less resistance which makes the guage read higher. | | |
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