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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Mod | | | Forums66 Topics128,004 Posts1,055,246 Members48,418 | | Most Online14,466
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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| | | | Joined: Jun 2005 Posts: 86 New Guy | | New Guy Joined: Jun 2005 Posts: 86 | As many bolters know, we have been having trouble getting the gas gauge to say what it really is. It reports half full, when it really fill to overflowing (literally).
A mechanic (other than me) took a look at it and put some kind of meter on it. Said we had a 35 Ohm sensor and we needed a 45 ohm sensor. Is he telling the truth, or am I being taken?
I did convert the system to 12 volts and have a resistor in the line to the gauge. | | | | | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | The gauge and the sending unit should both be 30 Ohms for your year. Can I assume that the resistor is between the 12 volt source and the gauge? Does the gauge go to full when you disconnect the wire to the sending unit? The system is really simple: You only need six to eight volts to the gauge, ground to the case of the gauge, continuity(a wire) from the gauge to the sending unit and a good ground to the body of the sending unit; all of which are easily checked with a multimeter. | | |
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