Hey Wm - nice write up so thx for that. I'm in the middle of planning my oil cooling system, was all set on the Canton thermo just like you and Penny, but a local racer supply shop steered me to Derale instead. Have you looked at this or have any opinions on the unit? It's -12 AN in and out, lightweight, small and easily mounted.
For lack of a better link:
http://www.etrailer.com/Accessories-...FQUSbAodf1l-Lg