My electrical system and dash are out of my SUV1200, but I want to check the gage to see how many hours the ski had on it before the engine blew. I've hooked the system up outside the ski and get it to go to start mode or Code mode, but can't get it to go past..usually it senses the engine running. I don't want to take a chance and blow the gage as I'd like to sell it, but does anyone know which wire will make the gage go live so I can check the hours? Thanks!