Roughneck, thanks for the info, did your MEFI 3 system have the old rectangular diagnostic connector or the new "modern" OBD - II connector. Mine is a marine application that has a unique 10 pin diagnostic port. Any pictures or drawings of how you connected to your MEFI and the jumper you...
I have a TTSdatamaster for the MEFI3 it was a beta version I called them and they gave me a free license I used my LT1 cable with a couple jumper wires for the grd and serial data