My gas pedal on Thrustmaster TMX force is not working, everything else seems fine on the wheel. The gas pedal only registers as clutch in Advanced settings. The pedals work fine in other games on the same PC.

Check the option "report combined pedals" in your wheel software. It should be turned off. It can have a different similar name depending on your wheel manufacturer. Make sure that all dead zone options are off in the game advanced controls menu. Also, try different options for pedal axis: “two ways” and “one way” (in the same game menu). Here’s a video tutorial, how one of our users setup his Thrustmaster wheel – maybe it will help.

I tried your suggestions, not OK.

I however, found a workaround. I am using TMX FFB (not pro) so my base has two physical pedals only, not three. There is no Clutch pedal.

I setup the phyical Throttle Pedal (the right hand side one, which is recoginized as the Clutch Pedal inside this game) to use for Throttle function in the setting and let the Clutch function be EMPTY.

Then it worked. Since I drive auto tranmission car in real world, I also drive auto transmission in this game. I do not need Clutch anyway so I can let it be empty.