BIGRED:
I'm trying to find time to deal with this issue myself.
The sending units typically go in one of two spots:
1. Remove the oil (or tranny) pan, drill a hole and weld on a nut to screw the sending unit into.
2. Cut the hose from the pan/pump to the cooler (of course NOT from the cooler to the pan!) put on compression type hose ends, and screw the hose ends into a t-block type manifold that also has a threaded hole for the sending unit to mount in.
Autometer has a kit with the hose ends and manifold block for hoses with a 3/8" O.D. ($36).
Dakota Digital has a kit for 3/8" I.D. #SEN-04-11 ($36) and one for 5/16" I.D. #SEN-04-10 ($36)
Now for the rub, the information that I have from a Senior Tech at DeLillo Chevrolet (you've no doubt seen their banner ad on this website) is that the oil cooler line is 1/2" I.D. and the tranny is 10MM I.D.
I haven't crawled under to verify, and I posted here about a week ago asking if anybody could verify or deny the hose sizes but had no replys.
Worse comes to worst, I plan to order hose ends; and a friend has already volunteered to make the t-blocks for me (he's a die maker/machinist who makes similar t-blocks frequently).
If you can verify the hose sizes,
www.hose-man.com is a good source for the ends, and we can machine two sets of blocks almost as easy as one set if it'll help you out. I know you're a very accomplished fabricator and probably don't need help, but let me know.
BTW, really like much of the stuff I've read about your truck's mods.
/Gary