Sketch of Couple Students Standing on River Embankment Together for Haltech Nexus S2 S3 Plug 'n' Play Adapter Harness. If you are using a factory harness and are after an easy ECU upgrade, take a look at Haltech Plug 'n' Play Adapter Kits. These adapters plug directly into your Haltech ECU and have a set of factory connectors on the other side which plug straight into the factory harness. A simple Haltech Plug 'n' Play product that allows you to be up and running in just a few hours. The quick start guide will walk you through installation of the Haltech Plug 'n' Play adapter into your vehicle. Suits: Plug 'n' Play replacement of the factory ECU for Honda Integra DC5 Acura RSX 05 06 Manual transmission only. (Does not support factory multiplexed coolant temperature gauge, battery light and AC request Please see the product quick start guide for further information) Notes: Does not support factory multiplexed coolant temperature gauge, battery light and AC request Please see the quick start guide for further information.