help fitted a swoosh tacho no lights

[rob drag racer]

i fitted my swoosh tacho today and cant figure out how to set up the lights for night view there's a cord from it with 4 gray wires and a yellow i understand where and how i would fit it to the lights on switch but cant figure out how to with these wires has anyone came across this before and if so i would love the help

other than that it works fine just cant see it at night !!

[rob drag racer]

surely someone knows and can help

[VrWagz1]

It must have come with a manual to give you a clue. I would imagine 1 wire is earth and another will run to the globe. Can you pull the globe out at the back and continuity test the wires to work it out, that would be the easiest.

[rob drag racer]

no manual it was second hand i might try again today

[SMIT]

I just went and had a look at a swoosh tacho i had lying around mine has 5 wires coming from it:

These 3 wires are connected to the rear PCB board:
red = 12v
blk = groun
green - tacho pulse

These 2 which i assume are the illumination and seem to be connected to the outer edge of the tacho
red = illumination wire (tap into ciggi light power)
blk = ground

[rob drag racer]

problem solved thanks guys