Hey I-A i like to know what might be the problem with my tach. When car is fully warmed up, the tach is reading 1000 rpm on idle, and my vtec is popping at 4200 rpm and its redlining at 7800 rpm. Im runing a obd0 pr3 ecu, i was told vtec engages at 5200 and redlines 8200 on the stock pr3......which is not doing so, so let me get some ideas of what might be the problem thanks.