Quality dose not only mean accuracy it also means durability. I'm a firm believer in you get what you pay for and if you don't pay for it don't expect the moon. To some of these hobby track guys that 1/2 or 1/4 pound does make a difference. I also am very anally retentive about my tire pressures and check them before almost every ride. Would I pay $90 or maybe a little less for a MotionPro gage? prob not, but I don't think it would break the bank if I did to get a quality tool.
My old man Siverado takes that too, his might be 0W30. He told me he wasn't going to use it because the thinks it's too thin(old school thinking). I said, Don't tell me when you motor takes a crap then because with too many col start ups it will. He just dose not understand how it work even though ive tried to explain.
Regulators fail all the time. My machine at work is pressure sensitive and we replace probably 2 to 3 regulators a month out of a few dozen. Mostly due to moisture in the lines because our air dryer sucks.
I doubt it. The GMs have a self learning mode on the car that works really well. Ones for my GMs are around $20 to $25 on Amazon which was about $10 to $15 cheaper than the parts stores