After reading positive reviews on this product I purchased this unit and installed it in my Jeep Wrangler which is used for off road expeditions along with an ARB CKMTP12 onboard dual air compressor with air tank (which is amazing). Was hoping to save my back from the constant flexing and testing of psi. The unit is solidly built BUT it just spins and can't get the tires to the set PSI value. to about 15 psi. The unit just keeps pumping air above 35 psi and then crashes with an error of about 50+ psi! Very strange! This also happens when I use my other Bushranger backup compressor (no air reservoir) - so it's definitely a FAILURE unit! I also zero the OPS (Over Pressure System) etc. (since I don't need a bead mount on my all terrain tires). This is only accurate if the tires are "deflated/aired". But "inflate" just DOESN'T WORK! I am mechanical/technical and quick-witted. I've tried all possible options to get this block working. Either the product is defective or garbage! I am now considering returning the unit (which can get expensive) unless I get an explanation/replacement from the seller/manufacturer. For your health.