Being a lazy ba5tard I've had a loads of stack gauges in boxes for ages, and now I finally want to fit them.

In particular I want to discuss the oil gauges, where/how is best to fit them? I see some people have used 'sandwich plates' onto the oil filter housing, or adapters onto the oil pressure switch point on the block, what does everyone reccomend, and more importantly, what specifically did you use and where did you procure such an item....!