You'll struggle to tell the difference between the G-Force and the Hobbywing - except for the £50 you will still have in your wallet! These two are the best for GT12 as the switch and capacitors are built in, saving a whole load of space in the car.
With both, get the programming box. It makes it possible to adjust several settings in the speedo that will set it up nicely for your driving style. Both come with software you can download free from their sites if you want to always have the latest firmware. HTH
