Munchkin/Pinnacle gauge number

There is a press/temp gauge included with a Pinnacle boiler, has a well with a spring loaded flapper so you can remove the gauge under pressure. I need a new one and the local Pinnacle dealer is of no use, since this part comes shipped loose and is not part of the "parts" page. I need a new one and would like to incorporate this on other jobs. Before I spend all day driving around, does anybody have a part number that the Munchkin people could relate to? For the gauge and the cool well? Or someplace I could buy this? So far, it's been "We ain't got nuttin' fancy like that 'un there."