Big Bart
Tow&Slow
Likely your pressure sensor is bad. Maybe start by replacing it. The IH engine is more about volume than pressure. IDI’s run about 12-15 psi at idle and 45-65 psi on the hwy.A normal truck. Ahhh....that sounds so good! Sounds like time to leave it alone. Runs and sounds really good to me.
One more thing I'd like to know and it may only apply to Uhauls. It has electric over oil over brake fluid or whatever. It's electric but has an oil pressure light. Brakes are outstanding. Changed brake pads all around and changed the brake fluid when I first got it. Before that the oil pressure light would sometime come on. Call the Uhaul mechanic that I got it from and he said it was just dirty senors not to worry. Turn off the switch and restart and it likey wouldn't show up again for a long while. But now it stays on most of the time, like all the time.
So I'm wondering if the best approach is to remove the sensor, clean, put in a new one, or just go to a manual actual pressure gauge.
But a mechanical gauge would also be a good idea, just takes a little time to put in.