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Super Member
Got the gage from Napa Auto Parts. They call it a liquid and air gage. Cost me about $8.00.
I don't think these help with Rimgard. Rimgard is beet juice and thus leaves a sticky residue when dry. The air/liquid gauge that you bought are more for calcium filled tires and are either brass or plastic so the chloride doesn't eat them up. If your tires are filled with Rimgard, it is probably a good idea to flush even this type of gauge with hot water when done using it.