I know this isn't a real popular ECM next step up from a 1227747 Im having a problem getting SA to show in ADX and XDL using TPRT and ALDL extreme cable.
All of the other parameters are showing good data just cant get spark advance info when data logging or on live data. Im running with stock drive train very little modification. fueling looks good just need to change spark tables and want to data log and check knock counts to adjust from there. Any Ideas?

1990 K3500 454 ci T400
Thanks in advance
Byron