Will this bolt directly into my factory cab light hole?

Yes, it mounts at the OEM cab light location — no drilling or modification needed. You may need basic fasteners depending on your truck's condition; test-fit before final installation.

Does this include a wiring harness or do I need to splice into existing cab lights?

Wiring configuration is not specified — confirm your truck's stock wiring setup before purchase. You may be able to use existing harness connections or need to wire directly; your service manual will guide you on voltage and connector type.

Can I use this as a standalone cab light or does it need to tie into factory switches?

Installation method and switch compatibility are not confirmed in the specs. You'll need to determine whether to wire into your existing cab light circuit or run a separate switch — consult your truck's wiring diagram to plan accordingly.