Quote:
Originally Posted by winmutt
For 85 and up diesels you get the tach pick up off the ring gear. This has two wires. How does this translate to RPM? I am trying to read this with an arduino and it's not clear if it voltage or resistance or what....
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Although a bit technical, it's not actually a Hall sensor, it's a VR sensor (varible reluctor). As has been pointed out, the signal is an AC signal that is read as one pulse every time the voltage goes from positive to negative.