AI answer Paul but typical fitting advice for any aftermarket gauge.
To install an aftermarket oil pressure gauge on a BMW B48 engine, you must use an M12x1.5 T-fitting adapter. This allows you to retain the factory warning sensor while accommodating your new gauge sender. The entire process involves installing an adapter, routing the sensor, and wiring the gauge.
You should be able to fit a combined oil temp and pressure sensor to feed combined gauge. I know VDO offered one and probably still do.
