Sure, just a couple of things. Do you have a voltage stabilizer or can you get one, it will read high otherwise and will look a little out of place, just use your convex lens and all will be fine.
I have a full set of gauges somewhere, I know the temp is broken, but could be a good buy for someone, they have the convex lenses.
Would not break the set for one gauge and surely there are a lot of them floating around.
Good luck. Wayne