The install goes sort of like this Defi sandwich adapter hook up:
http://www.defi-shop.com/product/dl/...ter_inst.htm#6

You attach the oil pressure sender to the sandwich instead of tapping the factory hook ups on top of the block.

There is a pretty good write up on the install here: http://www.doink.net/gallery/index.p...-cool_mod.html I have a purpose built sandwich adapter, so no need to mod up my own. The bit about pressure and temp senders still applies.