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Can't you mount it on the other side of the block where the bigger hole is with some small pipe and fittings and just angle it to the side where you can see it? I've seen this before but don't know what size pipe and fittings to get



That would be easiest. There are two taps as mentioned on the BB. From memory, the OE gauge uses the smaller. The larger (usually plugged off) with suitable bushing would work fine for the aftermarket gauge.

Whichever you use make sure to clean the area thoroughly first as any crud could go in the oil gallery. I start with a toothbrush and mild solvent, then simple green and a pressure washer and finally brakeclean.