I can't really recomend one as I'm not sure of your requirments. You mention a data logger, which is what my 2A1 unit is. I don't think they are making the 2A1 anymore so the equiverlent would be the 3A1 I think. My 2A1 can datalog AFR, RPM, 3 user inputs and 3 Thermocouple inputs either to...