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I have a used MyChron 4 with GPS05 unit I’m getting rid of. It logs things like your engine RPM, temperature, GPS speed, lateral and longitudinal acceleration, and creates track maps.
If you had one, it would be really easy for you to give us lots of information to troubleshoot your problems and get you going in the right direction.
A MyChron 4 costs 350 new, and the GPS is 300. I’ll sell them both shipped to your door for $340.