Your MINI does not come equipped with an oil pressure gauge. In order to add one yourself, you need to drill into the bottom of the oil filter cap to add the line to the gauge.
Luckily, Craven Speed found a remedy to this problem and created a little adapter to save your filter cap.
Just screw the adapter into the oil sending unit and run the line from there! Just like their FlexPod mounts, there is no need to drill. Quick and easy!