You can connect the GDL-82 power lead to the Xponder Circuit Breaker.
That is what I did. My xponder breaker was 3 amps. The GDL-82
needs a 5 amp breaker. So I replaced the 3 amp breaker with
a 10amp. Download the GDL-82 install manual (the unit doesn't come
with the install manual). All the info you need is in the manual.
RV-8A,180/CS/Carb, AFS 4500 EFIS/EMS
RV-6, sold, 820 hrs of fun.