The fast sensor is 12v in 0-5v out 100psi sensor. The xfi looks for any 0-5v input. There are sensors on eBay that are much cheaper. You can find a 5v, 12v, 100psi or 200psi sensor and it will work fine as long as it is a 5v output. The fast sensors are SSI brand. You can scale the pressure range in the software, so any pressure sensor will work fine.
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