I glanced over at my pile of junk and spotted the hand controlled vacuum pump, I kept it to bleed brakes.
on the top was a guage... I did not need it to pump brakes. Moving guage by hand something was sticking and I took it apart to clean. here is what it looks like (simply wanted to share). I calibrated it back to zero, and will use it soon enough. I have never checked my old sube, but do remember a comment on the carb versions, having one of the highest readings ever..will find out soon enough.
that copper flat curve seems to be an airtight channel, it responds to vacuum pressure...
and this is where it shows a reading.
cheap.. and now have two useful tools from one.
maybe get an LED light in there somehow, run a hardline into the car. so I can monitor...