Here’s the new SimVars in the MSFS 2024 SDK, I diffed the new SDK docs. With thanks to MS/Asobo:
AILERON TRIM MAX
AILERON TRIM MIN
AILERON TRIM PCT EX1
AIRCRAFT AGL
AIRCRAFT ALTITUDE ABOVE OBSTACLES
AMBIENT IN SMOKE
BALLOON GAS DENSITY
BALLOON GAS TEMPERATURE
BALLOON VENT OPEN VALUE
BREAKER NAVCOM4
BURNER HEATING POWER
BURNER PILOT LIGHT ON
BURNER VALVE OPEN VALUE
CIRCUIT CABIN SIGNAL GO
CIRCUIT CABIN SIGNAL STANDBY
CIRCUIT CABIN SIGNAL STOP
CIRCUIT COM ON
CIRCUIT ELECTRIC ENGINE ON
CIRCUIT HOIST ON
CIRCUIT HYDRAULIC VALVE ON
CIRCUIT NAV ON
CIRCUIT NAVCOM ON3
CIRCUIT NAVCOM ON4
CIRCUIT ROTOR BRAKE ON
CIRCUIT SLING ON
CIRCUIT STALL WARNING ON
CIRCUIT TRANSPONDER ON
ELECTRICAL CIRCUIT AMPS
ELECTRICAL CIRCUIT EXISTS
ELECTRICAL CIRCUIT VOLTAGE
ELECTRICAL EXTERNAL POWER AMPS
ELECTRICAL EXTERNAL POWER VOLTAGE
ELECTRICAL GENERATOR ACTIVE
ELECTRICAL GENERATOR AMPS
ELECTRICAL GENERATOR VOLTAGE
ELECTRICAL GENERATOR SWITCH
ELEVATOR TRIM MAX
ELEVATOR TRIM MIN
ELEVATOR TRIM PCT EX1
ENV CLOUD DENSITY
ENV SMOKE DENSITY
FAILURE ACTIVE
FAILURE VALUE
FLAPS CURRENT SPEED LIMITATION
GRAPPLE HOOK SET
HIDE AVATAR IN AIRCRAFT
HOVER INDUCED VELOCITY
HYDRAULIC ACCUMULATOR PRESSURE
HYDRAULIC ACCUMULATOR QUANTITY
HYDRAULIC ACTUATOR ACTIVE
HYDRAULIC ACTUATOR PCT INTEGRITY
HYDRAULIC ACTUATOR PRESSURE
HYDRAULIC PRESSURE
HYDRAULIC PTU ACTIVE
HYDRAULIC PTU DIRECTION
HYDRAULIC PTU PRESSURE
HYDRAULIC PUMP ACTIVE
HYDRAULIC PUMP PRESSURE
HYDRAULIC RESERVOIR PERCENT
HYDRAULIC RESERVOIR PRESSURE
HYDRAULIC RESERVOIR QUANTITY
HYDRAULIC SWITCH
HYDRAULIC SYSTEM INTEGRITY
HYDRAULIC VALVE ACTIVE
LEAD POLE SET
LINE CONNECTION ON
LINE BREAKER PULLED
LIQUID DROPPING DOOR FLOW
LIQUID DROPPING DOOR FLOW VOLUME
LIQUID DROPPING DOOR OPEN TARGET
LIQUID DROPPING DOOR OPEN VALUE
LIQUID DROPPING SCOOP FLOW
LIQUID DROPPING SCOOP FLOW VOLUME
LIQUID DROPPING SCOOP OPEN TARGET
LIQUID DROPPING SCOOP OPEN VALUE
LIQUID DROPPING TANK CAPACITY
LIQUID DROPPING TANK CAPACITY VOLUME
LIQUID DROPPING TANK CURRENT VOLUME
LIQUID DROPPING TANK TOTAL CAPACITY
LIQUID DROPPING TANK TOTAL CAPACITY VOLUME
LIQUID DROPPING TANK TOTAL CURRENT VOLUME
LIQUID DROPPING TANK TOTAL WEIGHT
LIQUID DROPPING TANK WEIGHT
LIQUID DROPPING TOTAL DROPPED FLOW
LIQUID DROPPING TOTAL DROPPED FLOW VOLUME
LIQUID DROPPING TOTAL SCOOPED FLOW
LIQUID DROPPING TOTAL SCOOPED FLOW VOLUME
MAX GROSS WEIGHT
MAX LANDING WEIGHT
MAX TAKEOFF WEIGHT
MAX ZERO FUEL WEIGHT
PNEUMATICS AIRCRAFT PRESSURE
PNEUMATICS APU BLEED AIR
PNEUMATICS AREAS MAX TEMPERATURE
PNEUMATICS AREAS MIN TEMPERATURE
PNEUMATICS AREA TARGET TEMPERATURE
PNEUMATICS AREA TARGET TEMPERATURE PCT
PNEUMATICS AREA TEMPERATURE
PNEUMATICS CABIN ALTITUDE
PNEUMATICS CABIN ALTITUDE RATE
PNEUMATICS DIFFERENTIAL PRESSURE
PNEUMATICS DUCT PRESSURE
PNEUMATICS DUCT TEMPERATURE
PNEUMATICS ENGINE BLEED AIR
PNEUMATICS ENGINE BLEED AIR PRESSURE
PNEUMATICS ENGINE BLEED AIR TEMPERATURE
PNEUMATICS JUNCTION LINE OPENING STATUS
PNEUMATICS PACK FLOW
PNEUMATICS PACK FLOW AUTO
PNEUMATICS PACK FLOW MODE
PNEUMATICS PACK FLOW MODE VALUE
PNEUMATICS PACK FLOW MODE VALUE HIGH
PNEUMATICS PACK FLOW MODE VALUE LOW
PNEUMATICS PACK FLOW MODE VALUE NORM
PNEUMATICS PACK STATUS
PNEUMATICS PACK SWITCH
PNEUMATICS PACK TEMPERATURE
PNEUMATICS TARGET CABIN ALTITUDE
PNEUMATICS VALVE MODE
PNEUMATICS VALVE STATUS
PNEUMATICS VALVE TARGET STATUS
PNEUMATICS VALVE SWITCH
RECIP ENG BRAKE POWER PCT
REFERENCE SPEED MAX IAS
REFERENCE SPEED MAX IAS GEAR DOWN
RUDDER TRIM MAX
RUDDER TRIM MAX
RUDDER TRIM PCT EX1
SEA LEVEL AMBIENT TEMPERATURE
TCAS INTRUDER BEARING
TCAS INTRUDER DATA
TCAS INTRUDER DISTANCE
TCAS INTRUDER NETWORK ID
TCAS INTRUDER RELATIVE ALTITUDE
TCAS INTRUDER RELATIVE SPEED
TCAS INTRUDER VERTICAL SPEED
TCAS MODE
TCAS RECEIVED RESOLUTION ADVISORY
TCAS SEND RESOLUTION ADVISORY
TOW CABLE RELEASE REASON
TOW CABLE TENSION
TOW PLANE CONNECTION
TOW WINCH CONNECTION
WEAR AND TEAR CHECK PROGRESSION
WEAR AND TEAR EXPOSED PARTS LEVEL
WEAR AND TEAR EXPOSED PARTS LOWEST LEVEL
WEAR AND TEAR IS FAILED
WEAR AND TEAR IS WEAK
WEAR AND TEAR LEVEL
WEAR AND TEAR WEAK VALUE