This part I didn't understand. I assumed the YW guys have to install the tune. I'm not sure how to do it myself, I'm fairly mechanically minded as an aircraft mechanic for the last 40 years so doable with instructions. Then my guess would be , buy the program online and the tool to install it? And, it sounds like both tunes could be installed and the switch between them?
My best friend was a Blackhawk mechanic in the Army National Guard - also crew chief of his medevac unit - nothing but respect for what you guys do!! He taught me the trick of starting all bolts backwards to avoid any crossthreading.
I was rowing the same boat you are with regards to heading in to uncharted waters with vehicle programming. I ordered everything with a reluctant hesitancy of a bricked ECU in the back of my mind and waited for it to arrive. It shows up and I'm like a kid at Christmas - I'm about to go all Fast and Furious on my V8, you know?!
I am a cloud consultant, so also pretty savvy around tech. Sat down and read through the instructions - and that feeling came from the back of my head to the front, haha.
I emailed Erik whom I had spoken with from Day 1 - expressed my uncertainty with the process and concerns with bricking the ECU and asked if he would mind getting on the phone and walking me through the process.
He agreed to a time that same afternoon and I hooked everything up to be ready for when he called. Erik then called and stayed on the phone with me from start to finish - maybe took 30-45 minutes and that's only because I was super slow going through the process and trying to commit to memory for future flashes and also downloaded the VF Tuner app on the laptop which I probably should have done prior to the call.
I'd recommend a Norco battery tender or some other tender that will maintain 12v at least through the flash process. I have the Norco 10 and it had me at 12.9-13.5 through the process.
32 days ago, I didn't even know tuning was available for our engines (it's only been around for a couple years and there's only a handful of us out there, apparently).
I can absolutely say YW will make sure you are taken care of after the purchase.