PCIM176J panel meter
It's probably from the 1980s pre-internet era. A quick Google search finds it is a panel meter made by "Printed Circuits International". 

Most such digital panel meters of that era were based on the ICL7106 chip and are fairly standardized. You may have better luck simply looking at the connections and figuring it out. There should be power, analog input and some way of actuating the decimal points.