I installed the powermaster 140amp. It fits the stock mount with no modifications (if it's a fox body 5.0). The one wire from the alternator to the positive side of the battery was all I needed, and it is supplied, as are the connectors, with the alternator. I taped up the original alt plugs with electrical tape and tied them neatly out of the way. This installation will not affect the stock voltmeter, as it is not tied into the alternator circuit. Very easy, and it solved my u/d pulley charging problems. My alternator excites at "startup high rpm", so I didn't need the extra wires and charges at idle.