Re: Question on gas gauge replacement
 

rebuilt two 29 gas gauges,both glass lenses had a bubble that magnified,I assumed they were factory,could be wrong.

Re: Question on gas gauge replacement
 

As mentioned, the early A's had a magnifying lens. You'll have to check the standards to see when they changed to flat glass. I always use the original glass and face plate, but use the new cork gaskets and neoprene float. My gauge still has the cork float I installed about 15 years ago, and it's still doing fine.