This "flow gauge" as they are called I guess appears to be the one that comes with the MM252.

It for sure isn't a cheap flow gauge since it costs $89.75 If I had to replace is at my LWS it would easily be almost $100 with our 8.25% sales tax in TX.

It lists the regulator as made in the USA with a 3 year warranty, so I'll try calling the welding shop I bought everything from on my lunch break and see what they say. Hopefully Smith flow gauges are really good and this is just a rare incident.

Don't want to have to fork out another $100+ to get a working flow meter/gauge.