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For my 904 in the drag car, I grabbed a nice used one from a GM vehicle & recalibrated it for the 904 with deep pan.
I would think one would work for the oil as well, and they're a couple bucks.
Might even try an auto parts store for a Dorman or etc. replacement.
We put a BIG pan on the car and used a calibrated sight glass on the side of the sump.