The Ssi-4 Plus Will Allow The Capture Of Data From 4 External Sensors. These Sensors Can Be Frequencies Such As Engine Rpm And Speed Sensors Or 0-5V References Like Map Sensors And Pressure Transducers. The Ssi-4 Plus May Be Used As A Stand-Alone System Or Integrated With Other Innovate Motorsports Mts Products To Create A Log Chain. The Ssi-4 Is Also A Key Component Of Innovate Motorsports Modular Tuning System (Mts). Using The Ssi-4 Pluss Serial Ports You Can Daisy-Chain Other Innovate Devices Such As The Mtx-L, Lm-2, Lc-2, And Tc-4 Plus.