I had finally got around to attempting to re-calibrate my speedometer after putting 4.10 gears in. I found a place called Dakota Digital and they sent me a "Signal enhancer" to change the current going to the speedometer from the ECM. I have to install this hand held unit between the ECM & Speedometer by splicing into the power wire which connects the two. Anyone know which color coded wire this power wire is? Which connector is it plugged to on the ECM? I do not have an owners manual to visualize the schematics of the harness. I was not interested in removing the gauge cluster to find out, HOWEVER if it does come to that, does anyone know how to gain access behind the speedometer? Any input is greatly appreciated!!! Thanks in advance!