I know of the ones that wrap around the spark wire but can you give me a link for the ones that conect to a coil? And when I remove the electric start that whole part of the wire harness gets removed allso , is this correct?The starter motor turns a chain that wraps around the starter clutch, which is behind the alternator rotor. You will have to take the left engine side cover off and take the chain out, then plug the hole left by the starter motor. Many tachs available, some that connect to a coil, some that just wrap around a spark plug wire. Not having one of the latter, I can't comment on reliability, but the wired kind can be quite reliable.