Ron,
The oil pressure unit connection is right above the water pump. There is a small fitting right under where the alternator sits. You have to connect bent steel tubing from this port to the sending unit that mounts directly above the fuel pump. The 403 in my TA is not a good example for vacuum connections..As I have none except for the distributor. I pulled them all off. I do have the pontiac service manual that shows where they do connect. Do you have this book. It is a green 1978 Pontiac manual. Hope this helps somewhat.
olds
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