The Ashcroft&reg multi-instrument assembly allows a pressure gauge, switch and transducer or any combination of two, on one iso-ring and flanged unit. In flow-thru applications when it is necessary that pressure instruments be isolated from the process, an iso-ring is used. A built-in needle valve dampens pulsation and allows the process to be locked-off for safe removal of the instruments for recalibration. Assemblies that fit pipes from 1 inches to 20 inches are available.