Jim Szemeti
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Jim Szemeti reacted to Adamw in Rx7 FD - Link G4+ Extr speedo output
Yes, if it was connected to a reluctor sensor originally it will be expecting a sine wave that crosses zero volts.
You can try the de-coupling circuit below, no guarantees for you but it will generate a simulated AC signal that crosses zero. It has worked for a nissan skyline speedo which is uses a reluctor sensor.
