Upside down regulator ?

I have a new two corny keg kit from Midwest and a Sanyo 4912 refrigerator. As it happens, I can fit the two kegs, the CO2 tank, and the dual regulator in the fridge if I put the CO2 tank on the left and have the regulator extend to the right. This means that the gauges are below the regulator rather than above and are upside down. The advantage of this is that I don't have to make any modifications to the refrigerator door. If I want the gauges right side up, I have to put the CO2 tank on the right and have the regulator extend to the left. To do that, I'd have to cut out the moldings on the inside of the door, which I'd rather not do as it is a convenient place to keep a few sodas cold. Will it harm anything to have the regulator upside down?

It doesn't matter. It'll be fine.

Not a problem. I have my tank on the floor and the gauges are facing up.