I have a 1990 Miata and am trying to get the tach signal to work correctly. I have tried cylinder numbers from 1 thru 8 and do not get an accurate display of rpm's on my traqmate dashboard AFTER downloading. Here is the weird part, when I enter 4 the rpm's match my tach and on the traqmate display unit when I test the settings in the car but when I test it in real time and try to review the data after I download it the tach reading in the traqmate dash is all over the place, Any suggestions?