Well...as far as i remember in this very thread The blu/yel wire from the 20-pin, connects to one of the wires (blu/yel) that used to connect to the USDM thermostat (this wire runs to the A/C pressure switch in the car)
also I remember Caz telling me that all sensors except for the sunlight one are just resistors without polarity, so it won't matter which wire is ground or the other.
So just cut off the connector from the JDM evap. sensor and splice a wire to run to Pin #17 (ground, lt grn/red) in the 20-pin connector and the other to pin #9 (brown) also in the 20-pin connector.
I hope this takes care of your problem...Let me know if you need me to explain this better
