The emulator and the labjack. There are 4 wires that you have to tap into on your stock harness. I believe its the cas and mas but its been a while since ive done it. You can also wire in a wideband into the labjack It allows your laptop to see live data from the ecu. When i played around with it I couldnt get it to show the same data I see in the ecutalk screenshots but the active cells in the fuel and timing maps are highlighted in green and it displays mas voltage and rpm at the bottom along with some other things. Ill have to plug my laptop in again to see everything it shows.