As far as the test port for line pressure it's on the passenger's side in the middle of the transmission and pointing forward, the forward one is the front servo, the one on the back pointing to the rear is rear servo and the one above the rear servo is the Governor test port. With the pan off, on the drivers side the line pressure nut is the Allen head and it's flush with a metal tab that is attached at 3 points, you want to turn it counter clockwise or loosen it 1 round for every 3 PSI you would like to increase. A 1/4 Allen wrench with half the elbow chopped off will be required to do the adjustment. Sorry I don't have a pic as it didn't get from the camera to the computer.
Jim