Disclosed herein are techniques for implementing vehicle ECU reprogramming, so the ECU programming, which plays a large role in vehicle performance characteristics, is tailored to current operational requirements, which may be different than the operational characteristics selected by the manufacturer when initially programming the vehicle ECU with specific instruction sets, such as fuel maps. In particular, an interface of the present invention comprises an interposer card that fits into a motherboard memory module connection of a computer system. Also included are an extrusion for housing bus bars operatively providing electrical power to the printhead modules, and a cover plate securing a flex printed circuit board in the assembly, the PCB forming a data bus to the printhead modules.