You decided to bring your 103 Twin Cam to the next level and added a new Vance and Hines exhaust system and VO2 air intake. You will need to remove the seat and find the LAN plug. Once found you can find a good spot for the Vance and Hines FuelPak installation. You will connect the FP3 and turn the ignition on and follow the instruction on this video and the product guide to pair it to you smartphone. Once paired and mapped you will have a variety of live system data you can access including error codes.