So I just recently got a Hondata and when I floor my accellerator my tach starts jumping everywhere it starts right around 4500-5000 and then it bounces to 0 and then goes all the way around. I took it to a Tachometer specialist and he was baffled. Does anyone have any ideas what the deal is? All I know is that I do not want one of those 4" tachs with the shift light I want to keep my stock stuff. Do you guys think it may be something with the ECU? I thought it was my spark plug wires but that was not it. Any ideas? Any help is much appreciated. Thanks in advance.