How to get T300 to work with WRC+PS5?

It should be plug and play. I had no issues with mine. If you want to use the TH8A shifter, you need to connect it to the wheelbase instead of usb. Otherwise the shifter is not recognised. In the past I used 4th gear as a handbrake, but it still is a on/off experience like using a button. Later I bought a TSS handbrake mod, which give more control for the amount of slide you need.

Should just work. I plug mine into the far left rear as the other rear sometimes flakes out. I have the TH8a in sequential mode and use the clutch for handbrake. It plays like an absolute dream.

Ok, thanks for the replies, I've been busy with other stuff and forgot about this. First thing I did after it not working was updating the firmware.

I have TH8A, I guess I'l have to bind handbreak to a button. Why doesn't it work directly plugged into the USB, and if I do this wheelbase connection will it still work on PC (iRacing)?

I'll guess I'll have to give it another go soon.

I know it's very, very late for a follow up, but I eventually got this working.

I just had to press down once of the wheel's dials instead of a button to login with the PS Profile ;D