With how much vehicle performance has been tweaked, I haven't really got the slightest idea what anything is doing anymore, because every part ends up being a tiny variable in a presumably complex hashed outcome and they often have little or no documentation except the object name and price to glean information from.
Some kind of diagnostic tool to get basic information about vehicle performance would really go a long way to making it something more than a mystery box. Potential things like mass, handling, velocity, an odometer, a digital fuel gauge, hardpoint information.
Characters can see how equipment effects their @stats, and modern vehicles usually can display a fair amount of information, so I think there's some logical precedent for a certain amount of data to be visible.
Why not eliminate the vehicle systems vest completely and rename the Cybertech Rig - then make the rig interoperable with chrome and vehicles? The interface itself would be very akin to the various vehicle prompts and ways to engage now but offer more insight into precise vehicle components.
In addition, the modules currently used for vehicle theft could be loaded into this new 'nameless rig' for use, and even better, blank ones could be loaded and custom programmed by those with the programming skill.
The ultimate goal is to continue working backward and get to a more universal physical technical world but this would be a good step of combining similar systems.