Ok, very clear instructions, I’m going in 1st. Thing tomorrow, thanks to you, I learned there were two to deal with, I am glad I installed the pressure switch to the correct side of the block. I assume I can get to it from top side? I’ll post how it turns out.Yes, the photo shows the sender for the oil pressure gauge. That is on the right side of the block.
It can be accessed without removing any other parts. It will have either a 14mm or 17mm hex against the block. You'll need a short, thin wrench to get on it. I use a bicycle wrench. They are stamped out of 1/8" steel so easy to cut/bend to make a custom wrench for the sender.
You can test the gauge & wiring by switching on the ignition then grounding the wire attached to the sender (remove it from the sender and touch it to bare metal). The gauge needle should go to maximum. If it does the gauge & the wire are OK.