I was reading my install instructions for my XFI and you can connect a sensor directly to the ECU . It has wires for sensors built in.
I don't know squat I'm just learning but I hope this helps . Wayne
This connector houses the 8 analog inputs that can be used for things such as fuel pressure sensor, oil pressure sensor, EGT probes, etc. An Analog Auxiliary input harness kit (part # 30-1402) is available from FASTä.
Pin A – AAUX1, blue/gray (C12)
Pin B – AAUX2, gray (C13)
Pin C – AAUX3, purple (C14)
Pin D – AAUX4, light green (C15)
Pin E – AAUX5, yellow/black (C16)
Pin F – AAUX6, blue (C17)
Pin G – AAUX7, brown/white (C18)
Pin H – AAUX8, white (C19)
Pin K – Analog return, black (C11)
2.1.20 AUX SHAFT
This connector is for the auxiliary shaft sensor input circuit. The FASTä VSS and auxiliary shaft harness kit (part # 30-1403)will supply you with the harness, sensor, and magnets to monitor things such as turbo speed and torque converter/clutch slippage.
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