I've got a guy thats trying to sell me a used tach. It came off a sporty that he use to own. He says it'll work on my 07' FLSTC, but I want to know for sure before I throw good money away. I've never installed a tach. on any of my scooters. If they didn't come with one, I figured it didn't need one. I still feel the same way, but he says he's going to make me a super deal, one I can't refuse. Maybe he's going to sell it to me for a buck. If this is a stupid question, go ahead and make your wise cracks, I need the entertainment... Thanks for any pointers you can share.