Bought the $30 budget one. I know...but it SHOULD work anyway! Screw the adapter into the block, pop on the quick connect, fire it up... nothing. Same on another vehicle. Find tools to work on new tool. Grrrr. Put air hose in gauge alone. Needle moves. Check. Can NOT get air to go through hose. Remove little Schrader valve core from hose...now hose is hollow and air moves through it freely. Try a different valve core...same problem. Pressure hits this valve from outside and is obviously meant to push it open (unlike in an inner tube where pressure holds it closed). So...the 90+ psi from my air hose will not push that little valve open and let pressure get to the gauge. WTF? There's something going on here that I'm not getting.