Pin 1 Black with Yellow stripe - illumination +
Pin 2 Black with White stripe - ignition +
Pin 3 Red with Yellow stripe - coolant temp
Pin 4 Yellow with Red stripe - oil pressure
Pin 5 Black - Ground
Pin 6 No Wire - Empty
Pin 7 Red with Black stripe - boost gauge
Pin 8 Green with White stripe - variable ground via rheostat
I can vouch these are correct..
Yes Steve, Pin eight, wire color remains the same at the panel dimmer switch to the left of the steering wheel.

