FAST Fuel Injector Adapter Harnesses and Connector Kits enable easy retro - fitting of both new and old style electronic fuel injectors. New style fuel injectors can be used on vehicles equipped with older - style Minitimer connectors. Retro - fitting a Minitimer injector into a USCAR harness is also possible with a different adapter harness. Connector kits, complete with terminals, seals, and plugs, are available as well, allowing direct re - termination of existing harnesses with the correct connectors, either Minitimer or USCAR.