You can be the first to see my newly listed items and sales. Don't be fooled by drop shippers claiming they have these in stock. These gauges are in my possession (as are all my items). Clay Smith Direct Mount Pressure Gauge - liquid filled. 1 3/4 diameter gauge is designed to directly onto the engine, line, or?1/8 NPT Center Back Connection. Silicone Filled for Vibration Dampening. Stainless bezel with Mr Horsepower logo on the face.