We recently released a dual inline oil sensor block that connects inline with your oil cooler (or transmission cooler) and has two 1/8" NPT ports for oil pressure/temp sensors. If you really wanted to you could even use one before and one after the cooler, to measure your coolers efficiency.

Link: http://www.improvedracing.com/sensor-turbo...lock-p-389.html

Price is $59 with fittings, available from -6AN to -12AN.