VFR minimum equipment: airspeed, altimeter, compass, tachometer, fuel gauge, oil temperature, oil pressure
And add a radio and a portable GPS
Less is more embracing simplicity
GPS? I've flown all over the East coast in my no-electrics 1941 T-Craft with no GPS and never got lost or felt like a GPS was needed.
The radio is optional but being able to announce your position in the pattern is a big safety improvement.
You didn't mention a transponder and since so many pilots are relying on traffic avoidance systems that require a transponder, I'm surprised you didn't include transponder.
BTW, I know of two local homebuilders that are not installing transponders as they do not plan on flying w/in a mode-C veil and their radios will be handheld units to they can talk to their buddies when doing formation flights.
Being a low wing airplane, I would definitely add fuel pressure.
A volt meter would be helpful as well since you have an electrical system.
And if you are going cross country or at night, I personally would not fly without an attitude indicator of some sort.