Have you tried CRE's suggestion of wiring in a rheostat to test the gauge? You can also check the wiring from the sending unit to the gauge using an ohmmeter and checking resistance. Infinite means there's a break somewhere, high resistance could indicate a poor connection, and little to none would mean your wiring is intact and the fault likely lies in the gauge or a defective sending unit.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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