Aftermarket Gauge Light Bulb Installation & Wiring Instructions

This document is Section 3 of an aftermarket gauge installation instruction sheet, titled 'Gauge Light Installation and Connection.' It explains how to install and wire the backlighting bulb for an aftermarket gauge. A note states that the gauge backlighting color may be changed to red, green, or blue by installing an optional color filter over the bulb, though this is not available for all gauge kits. The steps are: (1) insert the bulb and socket assembly into the receptacle on the back of the gauge and twist it clockwise a quarter turn to lock it in place (with a note that wire for gauge lights must be purchased separately, using 18-20 AWG stranded copper wire); (2) connect the RED or WHITE wire from the gauge light(s) into the vehicle's lighting circuit; (3) connect the light socket's BLACK wire to a good chassis ground; and (4) insulate all connections with shrink tubing to prevent shorting. Figure 4, 'Light Bulb Installation,' illustrates the bulb and socket assembly and the optional color filter being installed into the back of the gauge. The document is generic aftermarket gauge instruction material, not vehicle-specific.