Yeah the stock gauges suck, that's next on my list of things to replace. I don't trust them either.
Even my speedometer is like 10 mph off.
But back to the oil pump, since I have a new one I'm going to go ahead and replace it.*
I've unbolted the old one but I can't seem to get it past the sway bar, and tips/trick?
I tried jacking up the car from the front but that didn't seem to help much.
Edit:
*When I rebuilt the engine, I did not rebuild the pump.