One more thing: I know you said something about the old oil pressure gage affecting the choke. Would it make a difference if my choke was a maunual choke and not electronic? The carb I have is aftermarket (Edelbrock Performer 600 cfm) and I know I have to put the gas pedeal once to set the choke before I start the truck. Will that make a difference?
Only needed for electric choke. Also you won't need a tee and extension. The new sending unit can install directly to the block. The hole should be 1/4" so you shouldn't need any adapter. Only need the tee and extension if you are using both new and old sending unit. On a different note-you'll need to use a deep socket to remove the old sending unit.
So I attempted to takle this today and didnt get very far...because nothing was right for the job! The hole for the old oil sending unit was bigger than any adapter that came ith the gage ( but I'm confident I can get another bushing to make it fit ). The old temp sending unit looks like yours sapper, but 1) it was hard as hell to get to! and 2) after I popped the cap off of it, I could see an old brass bushing under it and the hole its srewed into isnt near big enough to recieve the new mechanical gage sensor. How did you get to the temp sender Sapper? It almost looks like I'd have to remove the A/C. I've included pics...and my old oil pressure sending unit doesnt look like your does. It has a cap like the temp sending unit, and then it also has a wire connected to it which I assume was for teh warning light ( not visible in the pic ). So I'm at a bit of a loss as to how to install the new temp gage.
OK In the oil pressure sending unit picture, to the left of the ignition coil (as viewing from the picture) toward to fire wall and attached to the BLOCK is where I installed the new sending unit. The connection that you show in the picture looks as though it is on the intake manifold. From the looks of the picture you have an aftermarket intake manifold and carb. To see the unit you almost have to be laying on top of the engine. Also If this is an aftermarket intake all you need to do for temperature is find a plug on the FRONT portion of the intake manifold (as the one in the pic). Make sure when you pull one of the plugs you see radiator fluid or residue from fluid. Typically aftermarkets put to vacuum ports on the back of the intake (behind the card).