I have the same rims and also purchased the TPMS from Gavin. I followed the recommended wheel change protocol and set the car for 18". The car recognised the new rims, I think after a re-boot, within a couple of minutes and all been fine since. The TPMS seem very consistent and correlate well with my calibrated hand gauge. I'd maybe try running through the routine again and see if they pick upThanks both. To be specific, I have gone from the original 20" Performance alloys to 18" Varros and TPMS from Gavin.
I didn't tell the car I had a wheel size change initially, but it gave me a TPMS not found message. So I changed the wheel configuration to 18" Aero V2s, and now I get a consistent fault.
I wonder if I should have left the wheels configged at 20" and been patient?