I was taught to do taxi checks as follows (making very slight turns while taxiing);
Airspeed Indicator- Indicating correctly (usually zero during slow taxi)
Attitude Indicator - Erect, stable and no errors
Directional Gyro - Free moving and turning in correct direction
Turn Coordinator - Moving in opposite direction of the turn
Altimeter - Within 75 feet of airfield elevation with pressure set
Vertical Speed Indicator - Reading zero (or whatever represents zero)
Magnetic Compass - Proper fluid levels, moving in correct direction, no leaks
I was also taught as part of the pre takeoff checks to set the nav frequencies for the first leg of the flight in NAV1 and to set the appropriate frequency for my departure airfields runway in NAV2 (and have the approach plates handy) in case I need to turn back for any reason and do an instrument approach shortly after takeoff.