Use your GBA to tune your car

File this one under, "jeeeeez". Turbo XS is a tool that allows you to turn your GBA into a "programmable,
upgradeable, automotive performance tool for tuning, data logging, and diagnostics."

The device plugs into your GBA, which then displays a number of diagnostic screens including a Boost Gauge, Exhaust Gas Temperature Gauge, Air Temperature Gauge and Tachometer. The maker of the device also promises additional diagnostics in the future.

All sensors are sold separately.

[Thanks theberlindoctor!]