GURPS Basic Set Vehicular Combat cheatsheet - Quick distillation of Basic Set Vehicular Combat rules.
This explicitly covers GURPS Basic Set second-by-second combat with vehicles, not Chases or Spaceships system.
Ran a few one shots with vehicles and it was rather fun, I encourage everyone to do so. While you're at it, I'd love to hear some feedback on the sheet as I personally feel it is unfinished despite seemingly covering everything needed for ground combat (some air and water stuff is missing though).