Below is the gauge I went with. You could choose any 2 1/16" gauge for the pod. Don't get a mechanical gauge. You don't need to have an oil line inside the car.
gauge- 3327- Just a moment...
this includes the sending unit #2242
I believe the threads in the factory oil filter adapter are 1/8NPT so you will need an adaptor
When installing the sending unit into the oil filter housing only tighenen it to where it is snug and runs into the thread tape. Do NOT overtighen it or you will crack the housing.