Does anyone know whether or not I can use the SEPST that came with my 2020 M8 FLTRK after the dealer changed the intake and exhaust before delivery, to tune my 2015 TC FLHTKL, or is it married to the 2020 FLTRK and can't be used for anything else?
I won't swear to it but when i got my 2010 road king with stage 4 kit and the race tuner, the dealer told me the tuner was married to the ecm in the bike. I'm sure there is someone with more knowledge than me that can tell you. also he told me not to go anywhere with out the small orange adapter because no dealer can get into the ecm if you have a problem with the bike.That was after i made the trip to sturgis 2010. I wasn't happy about that especially when i got back home!
No. They are paired ECM & SWPST
Pretty sure the one that came with your 2020 changes doesn't do much, more of a monitor than a tuner.