See accelerator bar
Good companions, the doubt arises to me like being able to visualize the percentage of accelerator, brake or handbrake in a horizontal bar in DashStudio
If you're asking if it can be done? the answer is yes. In fact, in the website's dash creation tutorial they show you how to bind the value for RPM to a horizontal gauge. As for accelerator (referred as "throttle"), brakes and clutch for that matter, is the exact same process.
Tutorial, all the way to the bottom: https://github.com/SHWotever/SimHub/wiki/Dash-Studio---Creation-Tutorial
As for handbrake, sadly, I don't see it as one of the options.
Just got it yesterday and I was asking myself the same thing 🙂 Cheers, mate!!