I thought that the oil pressure sending unit HAD to be the one WITH a gauge, NOT idiot light?
Mine came from a quest. The big canister style sending unit, not the little bulb ones.

OH, and start saving up for a Clearwater head or one from Odessa on Ebay. Thicker, and just better.
The stock one is going to crack. It's just a matter of time.
I ordered mine bare, ported it, used a "Schneider" regrind w/roller rockers and for the rest I used the quest parts. *(the quest/starion exhaust valves are SODIUM filled) BTW.. And lap those seats in.
I worked on a buddy's that he said RAN GREAT before a oil pump chain failure, but found a cracked head #2 and 3 after tear-down.

You might want to have one of your Dad's buddys re-curve your distributor a little for that weber. Being a 4wd, you might want your advance in quicker.

E