Oil Pressure Gauge Wire Route - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MTCK · 08-29-2015, 03:18 AM

So when I replaced the motor in my V3500 I replaced the loom on a bunch of the harness. The 93 motor I put in had a plug in the block (I think newer style TBI fuel pressure switch / gauge sender up by the distributor?), but I pulled it and installed a sending unit from Napa.

Now with the cleaned up harness I can't find the oil pressure gauge wire. When started the gauge pegs at 3:00 consistent with an open circuit. Can anybody give me a hint where the wire comes through the firewall so I don't have to pull the dash out. Thanks in advance.

08-29-2015, 03:18 AM	#1
MTCK Registered User Join Date: Dec 2009 Location: Fairbanks, AK Posts: 1,830	Oil Pressure Gauge Wire Route So when I replaced the motor in my V3500 I replaced the loom on a bunch of the harness. The 93 motor I put in had a plug in the block (I think newer style TBI fuel pressure switch / gauge sender up by the distributor?), but I pulled it and installed a sending unit from Napa. Now with the cleaned up harness I can't find the oil pressure gauge wire. When started the gauge pegs at 3:00 consistent with an open circuit. Can anybody give me a hint where the wire comes through the firewall so I don't have to pull the dash out. Thanks in advance. __________________ -Marcus 1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's 1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow 2022 Silverado 3500 L8T Project Daily Driver Project Heavy Hauler Project Plow Truck



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