Way back when, SuperXTim (Tim Breidenbach of Redwood Falls, MN) made some adapter harnesses that facilitated the use of the S&S speedometer calibrators without cutting into our wiring, allowing for the correction of the inaccuracy (about 11-12% faster) of the E-H factory speedometers and odometers. I have a couple of the harnesses, complete with the S&S units and the original installation instructions from Tim. they work quite nicely and simply plug into the factory harness at the speed sensor. I don't even remember what I paid Tim for the adapter harnesses, but I would consider selling these for less than the current cost of the S&S units through J&P Cycles.com. These are a MUST HAVE if you installed one of the 30 tooth output sprockets that were out there. Hit me up if you're interested.
