abmac Posted August 30, 2016 Share Posted August 30, 2016 I am installing a harness and ECM into a RW713 from a 1997 RD688s. I can't get the tachometer to work. When the engine starts, it goes to max and stays there. If I hook my old tachometer to the sensor from the flywheel, it works ok. The speedometer works. Does the ECM needs to be calibrated for the e9? Any suggestions will be appreciated. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/46627-rw-vmac-ll/ Share on other sites More sharing options...
kscarbel2 Posted August 30, 2016 Share Posted August 30, 2016 Just curious, is the "41MR" part number on the tags of the two wiring harnesses the same ? Quote Link to comment https://www.bigmacktrucks.com/topic/46627-rw-vmac-ll/#findComment-344006 Share on other sites More sharing options...
Mackpro Posted August 31, 2016 Share Posted August 31, 2016 Is there dip switches on the back of the tach? If so it might be set incorrectly. Hope this helps. sb732003 tach.pdf 1 Quote Link to comment https://www.bigmacktrucks.com/topic/46627-rw-vmac-ll/#findComment-344146 Share on other sites More sharing options...
abmac Posted September 3, 2016 Author Share Posted September 3, 2016 No dip switches.just a small microchip where the dip switches should be. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/46627-rw-vmac-ll/#findComment-344454 Share on other sites More sharing options...
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