All depends on what the use of the gauges are. I think peak/hold would be a little overkill for something like an oil pressure gauge. Also depends on what management system you are using and what you will be logging.

For something like boost, I personally like the greddy 60mm peak/hold w/s/b gauge but it is really hard to find in the 3bar version and well, I would ASSUME you are giong to be running more then 2bar so it would be kind of pointless. Also I don't think defi makes a 3bar gauge either. Find out what and what you need out of them and then find what fits that purpose.