Nothing good comes cheap, blah blah blah. I have to imagine that there are very cheap alternatives to buying sensors from the main motorsports sensor companies or big DAQ companies. Typically the guts of any sensor is based on individual components that are dirt cheap. Granted, that purpose built sensor will be more accurate, have a faster time constant, or more resolution, but could a team on a budget not get usable data for a handful of change?
Our team could only afford 2 linear pots from the suspension, and ran them diagonally opposed to estimate 4 wheel data. A few years ago, Claude asked, "how many wheels do you have? Then why do you only have 2 poh-tench-ee-oh meters?" He then proceeded to talk about a team that made a usable system with cheap radio shack rotary pots and told us that budget should never be an excuse, because you can almost always come up with a clever solution on the cheap.
For example: Cheap chinese eBay IR guns. Can they not be taken apart, repackaged and become IR tire temp sensors? They have to have some voltage output that could be read.
Wheel speed sensors are relatively expensive for what they are. Could those not be replaced by simple hall effect PCB's?