Tach output

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Total VEMS neb here. Got my car running but the tach is not reading rpm. It is a Stack ST700 tach and requires a ground signal to read out rpm. I had it wired to the factory purple black wire that comes from pin 40 on the motronic which, upon further inspection sends a signal and grounds through the factory tach. I look into the output assign and it says it is driving the tach off of pin 4 of the ec36. I have a plug and play ecu and can't figure out which wire that would be on the 55 pin. Any help appreciated

Also, I ran a fuel pressure sender to mcp3208 channel 0 but when I brought up the gauge it only reads voltage. Where can I find the settings to set it to psi?

Thanks