Hey Brother, no it will not affect the cassette whatsoever because you are tying it in tandem with it. Look towards the top of the thread where Lance actually did a cassette tie-in and he goes over it.
Awesome! I actually put mine in yesterday 02/20/2021 and everything works great thanks to you!
I will add a little of my personal insight to what I did and hopefully it helps as well.
I'll start by adding your diagram with the added bluetooth adapter.
I used the Millennia MIL-BTREC and bought...
Lance, thank you so much for posting this. Here in 2021 I’ve decided to do a Bluetooth adapter instead of an aux jack. The adapter has two RCA’s plus a 12v+ and a 12v-.
On the power side will I just tie the 12v+ to tape in/load side of the switch and put my 12V- to the H-Grd side of the...