I have a few questions about the Dakota digital BD-140 Does the BD-140 have a built in tach? If so, is it plug and play? Is it a three or four wire connection? My 04 mastiff did not have a tach but it did have a three wire connection under the dash that was not used that I believe went to an an analog tech mounted on the handlebars on the pitbull or the bulldog. When I switch to the new RIP 1 that extra three wire connection is now gone. So, do they sell an adapter that plugs in to the flat connector that goes to the indicator lights to pick up coil wire or will I have to splice into it? Or, am I completely wrong here?