the reason the speedo doesn't work is the VSS pulse is diffrent a standard honda VSS has 4 pulses to ground with 1 revolution on the cable , but the S2k and most newer vehicles for that matter it's closer to 20 so if you get up to a 100 mph it might register 1 mph on the S2k cluster so a correction is needed like a divider. also the coolant temp on the 2k and newer vehicle is the gause is controlled by the BCM instead of hooked up to the temp sensor. there was a guy that did the mods to the temp and speedo to make them work on older honda but canot recal the name.