I have had an Isspro fuel pres gauge for about a year now. Just recently I started hearing a noise coming from it and it has gotten louder to the point where it is annoying. It sounds like a ticking noise and is loudest at higher pressure (idling). As I hit the gas and the gauge drops it fades away. I'm wondering if my isolator diaphram has ripped because I checked the antifreeeze in the tubing at the gauge and it had dropped some and the antifreeze looked kind of dirty (possible diesel in it?). i tried toppping it off but no help. I'm also seeing more fluttering in the gauge at idle than I used to. Any input fellas??? Thanks.