Back in the day (two decades ago and more), I used to use these:
I did a quick check and haven't found these, so I assume they are no longer available. They were Quick Air brand. They simply screwed onto your valve stems and started letting air out of your tires. They allowed checking your pressures with a gauge as air was let out. The more they were screwed on, the faster they released air; so I could easily control how fast I deflated as I walked about checking pressures. As you can see, they screwed together and I kept them in the glove box of my '02 Tacoma TRD. They were inexpensive, I paid $12.99.
A friend of mine had these:
https://www.amazon.com/Australian-Or...0QBPBLWY&psc=1
They did the same thing, but were far more expensive.
Linear Mode
