Glo Gauges

[91TSI505]

Finally got the instructions for some gauges i bought:

here is the instructions i received:

1. Remove the screws of the upper dashboard
2. Take out the whole set of dashboard & disconnect the back wires cluster
3. Remove the transparent plastic cover of the dashboard
4. Remove all the screws from the original gauge face
5. Carefully slide in the luminous dials onto the surface of the original
gauges without removing the gauges needles
6. To aim at the luminous dial and screw back. (Do not over tight to avoid
short circuit)
7. Carefully put the transparent plastic cover back.
8. Connect the wires to the headlight power supply. (red sire for positive
electrode; black wire for negative electrode)
9. Connect all the wires of luminous dials to the inverter. (Find a suitable
area to install the adjustable switch)

I already installed the gauges but just had problems wiring them up.I got the red wire hooked up to the same power source i have my boost gauge wired to,and I have a dimmer control dial.Now what is a negitive electrode?(Where the black wire needs to go)And where can i find it?Thanks alot for everyones help

 

[wastefuldreamer]

Its a ground. Black goes to the ground.