I actually tapped all the wires for the time being, but I'm having this really weird glitch with my gauge. The gauge functions perfectly fine EXCEPT when the lights are on, the gauge start to blink from 50% to 100% and it's driving me crazy.
I tapped emission for IGN, other fuse for 12V constant, and tapped parking light wire by the headlight for the illumination. Something tells me it has to do with PWM or voltage is not stable in some of the wiring..