Will this plug directly into the factory wiring harness?

Yes, this is designed as a direct replacement for the factory cab light. The connector matches the original housing, so no rewiring or harness modifications are needed.

Do I need to remove the headliner to install this?

You'll need to access the mounting area from inside the cab. Refer to your vehicle's service manual for the exact removal and installation procedure for cab light access on your model year.

What's the difference between this smoked amber light and a standard white cab light?

Smoked amber produces a warmer, softer interior glow compared to bright white LEDs. The smoked lens also diffuses the light more evenly across the cab without creating hot spots.