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For an oil pressure gauge you have to install a tee fitting at the oil pressure switch then install the gauge where you want it in the dashboard. There isn’t any oil pressure in the oil fill cap.
you can order a new dipstick or clean up the old one an mark it with a file.
How does the MAP sensor have either crankcase pressure or oil pressure? It's in the intake manifold. The SS has another in the lower (cold side) charge pipe.
Oil leaking in the interior was always my pet peeve with aftermarket oil pressure gauges, yuck!
I was never thrilled when my service manager handed me a set of these to install in some kids used Camaro or Rustang! Most times the gauges and labour to install cost more then they paid for the car! I always would remove these from any used car I purchased.