I have had this tach in my glass case for years and have finally decided to use it on the '40. I was talking to a guy up in Puyallup that does battery-free sender conversions, thinking I'd need one. When I got home and pulled this out I realized that the wires are plastic coated and started thinking that maybe it was a newer model that just needs to be wired up. Do you know the scoop? If I don't need the sender, does anyone know the correct wiring for it? Thanks!