Using channel 6 for Autotune

I am using a Spektrum DX8 TX and a 6 channel receiver.
Can I plug channel 6 from the RX into channel 7 on the APM and use that it initiate Autotune?
I’m sure I can use mixing to select a switch to turn it on and off on the TX

Yes that’s fine to do.

sent from my phone so apologies for any typos