Just a heads up. I've just bought a Tekin RSX and a hot wire and down loaded both the PC and app. I can get the PC to work but could not get the app to work on my Sony Z5!
After a lot of messing about I found the if I connect the speedo to my phone, I get the connected sound. But I have to go into the phones settings to search for USB connections, it then 'sees' the speedo and fires up the app!
SORTED!
I hope this might help as I was really struggling to get it to work.....
This also might be the reason that the adaptors says they are OK, as they are! Its just the phone/tablet needs to be given a gentle nudge in the right direction.
Pete