11-01-2017, 09:26 AM
On my 93 coach, both the engine and transmission ECU put out a signal that could be used by the speedometer. I believe mine comes from the transmission. Given the changes between the making of our models I would be inclined to ask the factory what source they used when yours was made. It probably will still be from the transmission ECU, but given the way the newer ECUs talk to each other anything is possible.
Jon Kabbe
1993 coach 337 with Civic towed