Honestly it’s a much more ‘vernier’-like mechanism than I’d given it credit for.
The reason this is annoying in a shop environment is that there are likely other tools around with a vernier scale. That being said, I've also been around older machinists & engineers who exclusively refer to gauge blocks as "jo blocks", even when there wasn't a single set manufactured by the Johansson company in the building. This is common enough that searching for "jo blocks" returns a dedicated page on mc-master: https://www.mcmaster.com/products/jo-blocks
--Henry M. Leland, Founder of Cadillac and Lincoln automobile companies
From Machine Thinking video "Origins of Precision": https://youtu.be/gNRnrn5DE58?t=652
I guess this is a car engineer's version of "that thing you call the Internet is actually the web."
Dashboards were kept, and as gauges fell into use the gauges were mounted on or about the dashboard. So the dashboard is the ancestor to the gauge display holder, and to the firewall.
Patent US652940 (1900) shows a water-level gauge mounted to a dashboard in a "Whitney motor wagon".
That was driving me nuts.