Okay, here's another one for the Vulcan File of Stupid Questions (I hope mine aren't the only ones in there): I want to check the idle speed on my bike and adjust, if needed. Bought a portable tach yesterday, so I'm on teh right track. The Clymer's says, "Hook up according to manufacturer's instructions." My manufacturer's instructions are mostly for cars, GM to be exact (I guess there's some "adaptor" they included for GM vehicles). I know the black clip is my ground, and the green clip goes to...Something Very Important. But can anyone tell me what that Something is?