My friend just put a 99Si into his 96 hatch but now the tach in the cluster doesn't work any more. We hooked up a autometer one too and it didn't work either. Any suggestions on what could be wrong? He had the whole wiring harness from engine to ecu from the same si engine too. It is a 96cx. He also has the 99si gauge cluster in too. Not sure put do the all dohc engines only have two plugs that plug up to the ecu from the harness? Thanks ahead of time for any help.