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Looking for a new standalone engine harness for your LS engine? Tilden Motorsports has you covered with their LSx Engine Wiring Harnesses. Each harness is custom tailored to your engine. Tilden Motorsports is the first in the industry to offer a weather tight fuse block and weather tight connections standard on all of their harnesses. This ensures that connections are protected from the elements even in the harshest environments. All of their harnesses come with an easily accessible DLC (Data Link Connector) that is usually long enough to be mounted in the passenger compartment. This allows for easy access to the ECU via a laptop or standard scan tool. There is no main power feed required for this harness, just a single switched ignition power will switch a relay in the harness that in turn, supplies 12V power to all of the required engine sensors and the ECU. Each connection comes pre terminated and labeled for ease of installation. Optional upgrades include electronic transmission controls, electric fan controls, and AC controls.