I have several gauges, none less than 75 LBS. And all from my pile of parts. I will track down a low pressure one and see what I get. This is on my test stand and I used what I could find. No idea what pressure it had before, using 10w - 30, and just re plumbed the lines to the filter and the gauge using 3/16 steel lines. These connect to the plastic line going into the gauge
