Guys for my used 2010 Etec I bought a used harness and have a couple of questions.. (may be stupid ones )

I need gauges and the ones I plan on using are Tach, (with the warning indicators) speedo of course (likely GPS) volt, water pressure, water temp, and fuel.
Was wondering if all the OMC/BRP gauges from the fitch years on up are all pinned on the backside or ???? Would the water pressure gauge be part of the harness or will it strickly be a mechanical gauge? I really don't want the digital readouts in the tach and speedo as I prefer the look and ease of visibility of the gauges themselves for seeing what's happening.

Is there anywhere on the web I could look to see what connectors on the harness I have are for what function? Also any other gauge reccomendations as far as function type or manufactuer that are compatible with the Etec harness besides OMC/BRP gauges?

thanks for any help!