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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: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | One would assume a new sending unit is working OK. The best way to check is to check the resistance using a multi-meter. I don't know if 72 still used the 30 ohm sending unit/gauge set up or not. A check of your shop manual should tell you that. Assuming 30 ohms is correct and using 30 ohms as an example, if the sending unit reads 30 ohms with the float in the "full" position, the gauge should read full. If it doesn't and all connections and grounds are good the gauge would be at fault.
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