What would the right tire pressure gauge for a 1926 T?
A dial-type 0-60 PSI, or 0-100 PSI,readily available locally with rigid or flexible stem is good.
I think you might want to try and get one that has a higher maximum pressure reading if one exists because most gauges of this type have their maximum accuracy at mid scale unless you only want to get "close" at say 55.
Period Schrader gages show up on Ebay:
I just picked up a stick style pressure gauge at a farm store for trucks that goes up to 100 psi. If the sending units in my truck's tire stems are accurate, its right on the money. But for '26 Improved cars you would normally have balloon type tires and run from 30-35 PSI in either split rims or wire wheels. Of course you could still have clinchers on it if the car was one of the "economy" models.
If I was going to use a period correct tire gauge, I would want to check it against a known accurate gauge first. I have gauges from various manufacturers in four of our five cars - the T being the one without a gauge. Whenever I buy a new gauge, I check it against the others. If the newbie doesn't agree with the others, it goes back.
It was a period correct gauge that I was looking for. It appears that a "universal" schrader gauge would be ok.