The FuelTech FT Input Expander is a must - have for engine management. Use it when you've maxed out the inputs on your PowerFT line ECU and want to record data from more sensors. It's ideal for Pro Mod racers, engine tuners, and automotive enthusiasts who are serious about data logging. The expander has 20 analog inputs and 4 differential inputs, and it communicates via a CAN network using a 34 - Way automotive connector.