I am thinking about installing an electric water temp guage in my sleds. One is a zr600 cce which I know has 12 volt dc for the fuel pump, the other is a zl 550 esr. Does the zl 550 have 12 volt dc without the battery installed or is it 12 volt ac. I would think you would need the dc to charge the battery. Thanks, any and all info will be much appreciated.