Everything goes through the ECM. The combination meter also sends a signal via CAN bus to the ECM as well as the shift position indicator via CAN bus.
Since you had dash issues, look for a disconnected wire or connector.
Did they install an aftermarket ALARM system? (if I had a nickel for every F**ck up found after an alarm install.)
I cannot get a print out of the service manual. section EC-125.
Other sensors that send information for REv match to work:
-Crankshaft and CamShaft position sensors
Cluth pedal POSITION and Clutch Interlock switch
-Gear lever position sensor
-Input speed sensor
-Combination meter (via CAN bus)
Look under hood as well as under dash.
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