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mil wire is a ground trigger
other side of globe is ign
it should go out after u start car
but if it does come back on u need to get ecu reprogrammed to turn whatever codes come on if the codes are not really important
speedo wire and tacho wire just go directly to each gauge
if speedo dont work u need to program it first
if still dont work u need a pull up resistor
if tacho doesnt work u need a pull up resistor

if after all this it still doesnt work u need to look at tune but they should have turned tacho and speedo signal on if ecu came with the gmmp harness