Can anyone confirm function of these two pressure switches that run off the intake on the 1HDT? I think one is for the turbo boost light in the dash. What's the second one for? I can't seem to track them down in my wiring diagram.
Just FYI, when I increased boost on my 1HDT I swapped those sensors over for an oil pressure sensor from a different model car. Have a look on the Tridon site for part number and pressures. Basically you can change what pressure the green/red light come on for less than $50 in parts (if it’s important to you)
IIRC if you just remove them/leave an open circuit one of the boost lights stays on constantly which was annoying to me especially at night. Don't remember how I fixed it off the top of my head, I think when I replaced dash lights with LEDs I disconnected the light at the dash.