i got the diagram here right :
the plus sign on the back with a bolt next to it you need to wire to ignition switch.
the s with a bolt is for a wire which goes to the sensor.
the negative in the bottom middle with a bolt is for the ground.
the yellow and red and black are for the lightin as far as i can work out not the best wiring diagram lol.
so dose your gauge have more wires then mate or is there more wires when i get my sensors will i have more wires?