Sorry about the rough day, we all have em. They are inevitable running
this old equipment. That PTO is toast. In my thinking you have a couple
choices. Rebuild that one. All the parts including the gauge you referenced
are available from the sellers linked at the top of the home page here.
Or depending on your confidence level with working on it. You can buy
a rebuilt and just replace it. I have rebuilt a couple of these and they
work fine but not without a bunch a fussing with them. I have always
been kind of amazed at how finicky they are.
Just replacing the buttons will only cost you more buttons. Time to
take that one apart. If you get hung up just shout.
Ken
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