On your checkride, you will need to know 91.205(b) which specifies VFR Day Instrument Requirements for flight.
We use the acronym A-TOMATO-FLAMES to remember the required equipment.
Oil temperature gauge
Temperature gauge (for liquid-cooled engines)
Fuel quantity gauge
Landing gear position indicator (for retractable landing gear)
Anti-collision lights – (for aircraft certified after March 11th, 1996)
Manifold pressure gauge (for airplanes with a constant speed propeller)
Note: If the aircraft was not built with equipment, it is not required. For example, a Cessna 172 has an air-cooled engine and fixed landing gear.