Holley EFI now offers the main EFI Harness with throttle position sensor and idle air control connections for the Gen III Hemi engine. The main EFI Harness connects to all of the necessary factory sensors and related EFI sensors to run a plug and play Holley EFI system on your Gen III Hemi. All wiring is TXL grade copper wiring with minimal weight and uses a high temp sleeve in a small diameter to make running wire as easy as possible. Factory style terminations and connectors are OEM grade for strong and secure connections.