Rev Tacho Help Needed!!!

[TorqueFC]

hi guys

bought a rev tacho for the ute, just dont know how to wire it up. what wire goes where?? any help is greatly appreciated!!!

regards
Darcy

here is a pic

[craiga]

My guess is:
Black to vehicle ground
Red to dash lights +ve
Blue to points (coil -ve)

[fc_1958]

Hey Torque

My Guess

Red - Dash lights
Black - from brass nut to ground

The two wires coming out of the grommet  -
one to coil -ve
one to accessories fuse +ve

Personaly I would go for the grey being -ve,
however not sure

Don't know if you will damage it if wired in reverse
But ....  at least the gauge will light up