Do I need to run new wiring or can I tap into existing cab lights?

Tapping into existing cab light circuits is the common DIY path. Your truck already has wiring in the roof — you'll want to verify amperage capacity before connecting. Check your owner's manual or service diagram for the stock circuit specs.

Will this fit my cab's mounting location without drilling?

Mounting method is not specified in the product data. Before purchasing, confirm whether your truck uses factory studs, bolt holes, or adhesive mounts for cab lights. Test-fit and verify before committing to installation.

Does the LED bulb come installed, or do I need to source one separately?

The assembly ships with the LED integrated. No bulb sourcing needed — just power and mount.