S15 Launch control disarm via LH front wheel speed sensor

Hi guys I purchased a link plugin for my built S15. ( TwoStep Tunes) and it dynoed at 426rwkw on a roller dyno at about 30 pound.

Wanting to setup launch control, was going to splice into the front LH speed sensor. Two wire sensor, was hooking it up to DI6. ( I have purchased the extension harness ) do I only need to run the DI6 wore to it or run a sensor earth wwir from the expansion harness too.