I understand you're looking for themes to download. RealDash is a popular dashboard/digital gauge app for cars, often used with OBD2 adapters.
: User-created designs shared via the My RealDash web service. Accessing these requires a subscription to My RealDash. Where to Download realdash themes download
file on your device. (On Android, some users recommend using CX File Explorer if the default manager has permission issues). I understand you're looking for themes to download
Designed for sim racing, this theme places the gear shift indicator in the center, flanked by tire wear and ERS battery percentage. It is highly colorful (Carbon, Red, Ferrari Yellow variants). Accessing these requires a subscription to My RealDash
By subscribing to the My RealDash service, you gain access to a massive library of community-shared dashboards. To use these: Log in to the My RealDash website.
This theme removes the speedometer entirely and replaces it with a massive, linear tachometer that changes color from green to red as RPMs climb. It includes a dedicated handbrake light and water temp alarm.