Ditto that on the sending unit. Gauge function test is as easy as disconnecting the wire at the sending unit, then grounding that wire. You should see no pressure, then full pressure respectively. If you do, then your gauge and associated wiring is all OK and you know the sending unit is in need of replacement.
Two 14" 5 lug S5 wheels with ST205/75R14 Kenda Loadstar radials $349
Two 14" 5 lug S5 wheels with ST215/75R14 Kenda Loadstar radials $389
Two 15" 5 lug S5 wheels with ST205/75R15 Kenda Loadstar radials $409
Mounted, balanced and delivered.
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CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
2 LED 6" BRAKE LIGHTS DELIVERED $32