I just inherited a 1956 Mercury Monterey from a family member, been in the family since my great-grandad bought it almost new in 1958.  

It starts & runs, brakes work, however, I'm getting zero on the oil pressure gauge so I dare not drive it.  It's definitely not low on oil.  I was told the motor is in pretty good shape but I also know it hasn't been driven much more than up and down from a trailer in the past 5-10 years.

As far as I can tell, looks like this is an electronic gauge?  I'm an old Mopar person and the Y-block is definitely new territory for me.  Definitely need to get my hands on a service manual but I thought I'd ask here first.