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7080 fuel gauge

Printed From: Unofficial Allis
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Forum Name: Classifieds
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=185828
Printed Date: 31 Oct 2025 at 9:41am
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Topic: 7080 fuel gauge

Posted By: DCAC
Subject: 7080 fuel gauge
Date Posted: 16 Jan 2022 at 8:56pm

Looking for a working OEM fuel gauge for an "81 7080, NOS or good used, Thanks gentlemen!

Replies:

Posted By: Codger
Date Posted: 16 Jan 2022 at 8:59pm

Have you verified the gauge is bad and not wiring or the transmitter in the fuel tank, (sender/float)?

Posted By: DCAC
Date Posted: 16 Jan 2022 at 9:07pm

It's not my tractor, but supposedly it works, just not when the lights are turned on. A new reproduction gauge has been installed.

Posted By: Codger
Date Posted: 16 Jan 2022 at 9:26pm

that sounds like a wiring issue rather than a bad part. I'd check the 12VDC feeding the gauge to ensure it is not dropping off when the lights are switched on. If it works without the lights it seems the variable resistor, (sending unit) is working correctly.

Posted By: DCAC
Date Posted: 16 Jan 2022 at 9:43pm

Thanks Codger, I'll pass that along!

Posted By: Codger
Date Posted: 16 Jan 2022 at 10:13pm

This interprets as a corroded, or compromised electrical connection feeding the gauge. The variable resistor is usually connected to the negative side of the gauge and a switched voltage applied to the other positive side.

Posted By: DCAC
Date Posted: 17 Jan 2022 at 12:08pm

Thanks again, Codger, I passed this along to the owner as well!

Posted By: CrestonM
Date Posted: 17 Jan 2022 at 1:20pm

I drove a Steiger that had the gauges quit working when the lights were on. Turned out, grounding issues were at fault. Apparently it can ground through the filaments in the bulbs and that causes issues.

Posted By: DCAC
Date Posted: 18 Jan 2022 at 4:44am

Thanks Creston! I'll let the owner know that too!

Posted By: Gary(WI)
Date Posted: 18 Jan 2022 at 6:42am

Djs tractor has that gauge

Posted By: DCAC
Date Posted: 18 Jan 2022 at 6:38pm

I think that's where this gauge came from