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- You Reply: Thanks. I wouldn't actually need the exact gear setting, I'd just need to detect if the axle spins forward or backward. In the Wiki OBD list I see hex codes 61,62 & 64, all referring to torque. I've noticed that their values range from -125 to 125. Could it be that neg. torque values refer to movement backward and pos. values to movement forward? If so, I'm a good enough programmer that I could implement handling those PIDs in my copy of your lib.