Voltage on the back of the gauge with ground on bus bar and + lead on gauge is 10.5 max (sometimes 10.2 or 10.3). When + voltmeter is on + bus bar and - is on - side of bus bar then it is 15.5. Is there any controller between the bus bar and each gauge or does Moomba just wire from in daisy chain fashion from bus bar to gauges? I couldn't find a wiring pinout on the 06 OBV.