I'm restoring my first pump and didn't like the look of an empty sight glass. Filling it with some kind of colored fluid was just too much of a problem.

Amazon sells something they call glass paint, so I bought some and painted the inside of the sight glass.

The pictures below show the original sight glass and after being painted. Looks a lot more real to me!

P_20170320_155429-640.jpg P_20170320_155448-640.jpg