Originally Posted by
super70s
. . . When I first turned it on and hooked it up I don't remember it showing whatever pressure was in the tire (which was pretty low since I haven't taken the bike out in a year). I remember the digital readout getting up to about 30 psi, I felt the tire and it was really tight so I turned it off immediately instead of letting it get all the way up to 90 psi. . . .
The digital readout might not have shown pressure because after a year, there would have been very low pressure in the tires.
The wheels of an early '70's Schwinn Continental usually can't be relied on to retain tires reliably at pressures much above 70 psi, even if the tire labels indicate that they can take a higher maximum pressure.
Riding at 30 psi might feel OK but runs the risk of damaging the tires or rims or both from hitting a pothole.
You should keep the pressure at around 65 or 70 psi.