If I understand gauge terminology correctly, the term 'shockproof' means the gauge is filled with glycerin or some other fluid to keep the needle steady. The data sheet made no mention of the gauge being liquid filled; however, it performs like it is. The unit is the Auto Meter 2180 Auto Gage Silver 1-1/2" 0-100 PSI Mechanical Fuel Pressure Gauge. Cost was approx $30.