Im wiring my dash cluster of gauges now and im confused about there the wires go on the posts like the amp gauge and gas, temp gauge, i know which wires go there but i dont know which posts are pos or neg? like in the amp gauge, i dont want to cross the wires, ive got the dash facing me when i started wiring it so if anybody can give me the info ill be puttin the wires in from that position, thanks