This harness is a direct plug and play! All connectors are factory style and plug into all the factory sensors. Included is a full diagram of this harness and what each plug goes to. Also the wires that connect to your dash for speedometer, tachometer, park/neutral, tcc, malfuction indicator, DLC port are all listed for ease of installation. There is a full pin out of every wire on this harness included so there are no questions of what will and will not be used.This harness utilizes a 3 wire maf, 1 wire alternator, and factory EV1 style injector plugs.