If you're just concerned about pressure readings you can get a gauge for about $12. I have the low pressure style for mountain bike.
ACCU-GAGEŽ by MiltonŽ 0-160 PSI Presta Valve Bike Tire Pressure Gauge with Bleeder Valve - ANSI Certified (miltonindustries.com)

I have a 25 year old Serfas floor pump that still works fine. I also have a cheap floor pump that's about 10 years old, at least.
When you decide what pressure works best for you, consistency is more important than outright accuracy. If your gauge reads 10 psi high and you always use that gauge, then it doesn't matter how true it is.