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Good info, I have been running Acewell sensor with Acewell speedo for a few years and 30 odd k miles.Have to say it is perfect, no wires or sensors/pick ups at wheel, easy change for gearing, gps accurate to better than 0.5%.Guess with correct resistor any electronic speedo could be used.Note I had to use resistor plugs to get it to work, went haywire with std plugsAcewell tach has me beaten though, tried all manner of resistors before giving up, is accurate till it decides to read double speed, possibly interference from 4 leads for twin plug heads has too much electrickery dancing about. Sheathing lead is possibly only way, I cbf, did not have a tacho for last 30 years, do not need one now ! For novelty value it shows max rpm since last reset, I rarely hit 15000 more aften 13700 ish
A coaxially-wound sensor lead might help that. It's self-shielding. Some have an additional sheath of metal (usually aluminum foil) around the ground web. I've used it for the VAPOR tach lead, which wants to wrap around the spark plug wire for an inductive signal. Very M. Mouse. I make my wrap with the core wire and ground one end of the mesh. Along with the number of wraps around the spark plug wire, the mesh seems to damp out a lot of the interference.
Tried that initially with the chinese rev counter. Did not work on mine.I had to make a filter or whatever to get a decent signal. It worked, however, the chinese tacho lowest setting was 1 pulse per rotation and guzzi needs 0.5.I still did not manage to get to the workshop to check out the diagram.
Is the unit a rev counter using a shaft pickup, or is it a tachometer, using some other signal? I'm using both on the trike -- rev counters (2) to monitor the driveshaft speed (one for cruise control and one for a rev gauge) and also a tachometer to read the engine. Their operating principles are different.
I was confused when you said "Chinese rev counter." When I think that I think a $15 digital panel meter. That's why I asked.