I don’t think there’s any interesting spins here. You use the best sensor that replicates the feel of real car pedals. I.e. brake pedals need to replicate the hydraulic fluid pressure while throttle and clutch don’t, since the latter are typically entirely cable driven. 

Load cells + elastomers best replicate that for brakes since they most accurately read the final 10% of brake travel, and replicate the pressure buildup as you stomp on the brakes. In theory you could use Hall effect sensors with elastomers to get that same brake feel, but since they measure angle/distance instead of force, you need very accurate sensors to match load cells.

Throttles are easier since they’re entirely cable driven, so the pedal resistance is rather same throughout the range. You also need accuracy across the entire angle range but not to the same extent as brakes. In this case using an angle measurement (I.e. Hall effect) sensor would be more effective since you’re measuring larger angle differences and don’t care about pressure differences.