Installed an AutoMeter Cobalt oil pressure gauge and haven't decided where I want it. So, I put it in the little storage drawer. I teed off the stock oil pressure safety switch location with a fitting from Racetronix and used a 3ft Glowshift remote sender line. I killed a couple oil pressure senders in my M3 years ago until I ran a line to remote mount the sender. Had to pull the starter to install the fitting, but that's easy. The worst part is getting a safe route for the wires around the pedals. I spent a lot of time making sure nothing touched moving parts. The wires are in plastic split loom sheathing, but I don't want any parts rubbing. That 68PSI reading is a cold start. It showed at 29 when warmed up at idle tonight, and hits 100 when revved.

 

For reference, these are the parts
TEE, SOR M12x1.75 ORB Male » Female with 1/8" NPT Female side port - Item #: FIT-TEE001
2-1/16" OIL PRESSURE, 0-100 PSI, STEPPER MOTOR, COBALT - Product #: 6153
Sensor Relocation Hose Kit - SKU: GS-Remote-Line-Kit

Also bought an oil pressure sensor socket from the local auto parts store.