All great gauges to have Sarge...you can never have too much information about what is going on in the mechanical dept.
After a while you can pretty much avoid problems by knowing that something just isn't right with one of the readings.
I actually have two oil pressure gauges on my Towing vehicle....one to let me know the oil pump is doing it's thing and the other one tapped in near the end of the oiling system.
1989 Ford E350 RV Cutaway w/ 460 engine. Set up to tow 5th wheel, tag along, or goose neck.
2004 Fleetwood Mallard 33Z