'95 Corolla 1.6L aftermarket Tach Gauge install help?

Hello so I bought a aftermarket RPM gauge for my '95 Corolla 1.6L manual. It's a Equus 6086. I need help knowing where the Green and Red wires attach to. I am aware that the black wire is ground and the white one (from what I heard 1 person say in a YT video) is to dim the gauge light up and down with the dim switch? If it is... can I just leave it be or do I still need to wire it up somewhere? Thank you!!!
- Tony T.