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I put everything back together and took the truck for a test run. I have oil pressure and it's within spec! It seems that up to this point I wasn't getting accurate oil pressure readings. Previously the oil pressure gauge would read 60-75 PSI heading down the road while still somewhat warming...

An update: I solved the problem! And it was kinda silly how and I still have a sender on the way. This post in the HMMWV board describes a condition where the nut inside the rubber Packard connection seal was loose and causing an intermittent connection through the sender. It turns out my oil...

I kinda feel like the A3 is familiar enough to know a lot about how it works like the A2, but different enough for unfamiliar things like this to happen. That's probably because less than 6000 A3s of four flavors were built. A new sender is on the way, then I'll try it again and see what...

An update: It appears the oil gauge troubleshooting instructions for the M35A3 are incorrect. The gauge is working properly- I just had to follow the M998 HMMWV troubleshooting procedure to figure that out :rolleyes: I'm not sure if this is just a thing with gauges going up to 120 psi. The...

I'm questioning whether the troubleshooting instructions in the M35A3 TM are correct now. I compared those instructions with the M998 HMMWV and the M939 5-ton: For the M939, if lead 36 is disconnected at the sender and the gauge needle deflects when lead 36 is grounded to the frame, the...

I'm trying to figure out if my oil pressure gauge is shot. The last drive during cooldown the gauge was reading under what idle pressure should be. Prior to that the gauge was reading properly with the truck parked and driving. I thought the truck was idling lower than usual, which could've...