First things first, the engine has run fine and I haven't noticed and extra noise or strange behavior from it so I'm led to believe this is a sensor/electrical issue but that'* just my take.

Yesterday while heading out to lunch I saw that my oil pressure gauge was pegged at 120. I figured no big deal the sender must have quit, stopped and got the new sender, also did the same oil pressure mod Dan did on his car. Last night and this morning the oil pressure was a steady 60-70 hardly moving at all, then on the way home from work it started dipping lower and lower until it was 70 when driving and 14 at a red light. Pulled into the garage, checked the oil, still full and fresh from the change last night.

Now I go out and start it and the gauge doesn't move from 0. My next step as soon as I get the time was going to be checking the wiring, maybe I've got a bad ground somewhere. Anyone know where the oil pressure sensor is grounded to or what else I should look at?

Did you put the new sender in or no?

I also would assume the sender grounds through the block. Would make sense.

Yea, new sender is in.

Would make sense to me as well. Won't have time to go look tonight though.

If you were at zero you would know. You would have low power and the engine would be making bad sounds.

Yea, I figured. Wish I had more time to go out and figure it out, it'* going to bug me.

Well what do you know, the gauge was working after all, and I am now the owner of a diesel.

No noticed loss of power, just an all the sudden... man somethings ticki..... oh no, oh no, please tell me that is the semi....

PS: What a dramatic 2800th post.

When you did the mod, did you ensure the plunger was moving in the timing cover bore freely by pushing on it and noting the springiness?

There'* one of three possibilities I see.
1. Bad luck period
2. The gasket blew or had an internal issue (otherwise you'd have leaked externally)
3. Something wasn't 100% right on the install etc and the plunger hung up and kept the system from building pressure.

Which gasket are you talking about? The gasket for the sender housing? It'* not leaking externally. The car was running 70lbs until it started dwindling down to nothing.

The plunger didn't seem hung up, it moved in and out smoothly.

Yeah the oil filter adapter housing gasket. Should be the only one you had to get in order to do the mod. I'm thinking internally, not externally. And I highly doubt you could have put it on incorrectly, there'* really only one way for it to go.

It'* highly probable that gasket blew...
Thanks for the insight bill.