Audi enthusiast upgrades 2001 A4 gear shift with old smartwatch in 3D-printed housing — vide-coded WearOS app displays gear selection, can be used to control in-car media

A DIY hobbyist turned an old TicWatch Pro 3 into a custom gear-shift display for a 2001 Audi A4.

The project uses a tight-fit 3D-printed mount, motion sensors, and a WearOS app to detect gear position.

It also adds Spotify media controls in the car, with plans to expand into OBD2 telemetry.

The build blends hardware hacking, software, and 3D printing into a practical in-car interface.