Well 7,800 could be 7,200 with a really out of whack tach. If you look at the circuit board, with the end where the connectors go in closest to you, on the left side of the board, at the end furthest from you, there is a block of plastic standing up on its edge. Its about 1" high and about 1 1/2" long. That is the PA sensor. If your ECU is chipped, the 1st component closer to you is a flat chip with 28 pins on it. If your ECU is not chipped, you'll see a white line outline of the 28 pin chip, and it will say in white characters "27C256".
If there's a chip there, just to the left of it is where J1 is supposed to be. I'll try and find a pic for you.