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71meangreenc10 · 12-12-2006, 03:16 PM

Take a multimeter and check the new sending unit for ohms, run the black to the top of the sending unit and the red to the terminal, with the unit in the full position it should read low ohms with it in the empty position it should read high (either or) the only resistor is on the back of the gauge, if the new one reads 30 ohms then you will have to change the resistor on the guage to get it to work. I havent seen any resistors in the wires. I am going with after market guages so it wont matter which unit it comes with. The tank looks good and thats what I am going to do to mine.

Smitty

12-12-2006, 03:16 PM	#12
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,158	Re: 40 Gallon Tank Take a multimeter and check the new sending unit for ohms, run the black to the top of the sending unit and the red to the terminal, with the unit in the full position it should read low ohms with it in the empty position it should read high (either or) the only resistor is on the back of the gauge, if the new one reads 30 ohms then you will have to change the resistor on the guage to get it to work. I havent seen any resistors in the wires. I am going with after market guages so it wont matter which unit it comes with. The tank looks good and thats what I am going to do to mine. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time Last edited by 71meangreenc10; 12-12-2006 at 03:17 PM.