DashMeterPRO displays throttle/brake input and tire temp and pressure (I don't know if the pressure is displayed in real-time or if it is the value you dialed in in the garage. I'll check that...). You also have a g-meter which might be helpful to find your max ffb value or to avoid ffb-clipping, but it's not as comfortable as the ffb bar overlay in iR...
There are a few websites where you can find mods (tracks, cars...) already converted for GSC.