With ign on put a volt meter from the temp sensor lead on engine ( leaving it connected) under the hood to ground . You should see a voltage coming and going about every half second with a stock VR . Can’t see it well on digital meter , but easy on analog meter . If you see that fluctuation and I assume temp ( or oil) gauge is working ok ,VR unit is fine .
Tank gas gauge issues are almost always the sending unit, or wire near tank . the ones sold as “ exact replacement “ are usually not correct ohms .And the rate of change with gas fill is off . So you get strange readings .
Work it if out car in your hand ( ground it ) be sure it touches bottom of tank , if replaced try to get E right , as F does not matter as much . Keep old ones , sometimes can be cleaned and fixed . Never increase force of the little sliding contact on the wire winding , it will tear up the winding .
Be sure a good ground from the outlet pipe
To frame . One good way is scrape a clean place on outlet pipe wind 3-4 turns of 14 ga stranded building wire , then put small SS hose clamp around that winding . Other end to nut and bolt into car metal .
From description of jumping around , if the other gauges are ok , probably bad connection in harness , likely at tank or trunk wire or an intermittent ground of tank issue .
Rusty straps do that Or sender is in trouble . Good luck , frustrating …
Jg
By the way you can short sender to ground at tank terminal briefly , the gauge should go to full or beyond . Good test of wiring and gauge and vr .. Do that only if if other gauges are apparently working
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On Aug 14, 2022, at 6:40 PM, mplindahl@xxxxxxxxxxxxx wrote:
