Yes. The gauges each come with an easy method to use a custom unit of measure using the push buttons on the gauge. Programming a custom unit of measure simply involves adding a multiplier that converts from PSI to your desired unit of measure. You then give the unit a label.
For example, if I wanted to convert PSI to Head or Feet of Water, I would use 2.31 as my multiplier, since I have to multiply PSI by 2.31 to get Feet of Water. I would then type in the label of my unit. I could call it FtH2O, or Head, or FtWater, etc. If I wanted Feet of Oil, then I would need to factor in the specific gravity of oil to come up with my multiplier. It's a little math, but you only have to do it once!