Hello My speedometer went bad so when I REPLACED the Speedometer I took out my old gauge face and needle. Before I did this swap..When I use to drive on the highway my RPM was at 5 the speedometer would be at 80 mph. Now with the new swap on the highway going at 80 mph the RPM now reads 4 1/4. I think my Speed is behind by 10 mph. Anybody with some help will be greatly apreciated..Anybody out there with a Civic Si 99-00 or with an B16 engine swap PLEASE HELP ME????[&o]