If I recall correctly? Pin 10 on the EFIS is the encoder out going to the 327, the 430 the AP and what ever else that needs the serial encoder info so it has to be spliced as needed to go where is needed. It is at first it seems very confusing but if you follow the AFS diagram it should work. Also the 430 and 430W in this regard are the same. If however you want it to be part of your ADSB equipment then you would need an update to WAAS, don't complicate your thoughts with that now? BTW, If you got the wiring harness with all this equipment, it might already be laid out for you?? Hope this helps. Larry