Here's what 5.0 ALM did to his S650,
It does what you're trying to achieve, he's a member of this forum as well, for wired..just have to go through the firewall from the engine bay.
When I installed mine (24 Mustang GT - non coupe) I used #29 for ACC and #31 for CONSTANT. might be worth the try...Hopefully hings hasn't changed much
I don't remember who said it, but one of the famous tuners here mentioned driving in all the modes (normal, slippery, track, sport, etc.) for like, 10 to 30 miles each, so the transmission can "learn," since the s650 transmission is adaptive, apparently.
I did that, and my shifting got better...
Thanks for this write-up was finding another place to route any wires from the engine bay into the cabin, first option was behind the battery by the passenger foot well, but that requires drilling, might consider the route you took.
I got this installed for now as my front and the rear being used as a cabin camera. Still waiting and deciding what ill use for my rear, ended up using this dashcam for the cloud/remote monitoring feature.
Ddpai z60 pro
Fuse box hardwire