This is an x-gauge that measures the current drawn by the A/C compressor for 2010-12 FEH. Might work for Fusions and C-Max but don't know for sure. A rough estimate for power would be to take the displayed value of amps multiplied by 300 to get watts or 0.3 to get kW. Have seen 8 amps highest so far, roughly 2.5kW of power for an FEH or MMH. Fusion and C_Max have lower voltage batteries, if the x-gauge does work for them. TXD: 07C722406F RXF: 04628540066F RXD: 3008 MTH: 000200010000 NAM: Iac Saw 10.8 amps yesterday when it was 108. That is over 3.5kW....or almost 5 horsepower. That is enough power to pull the FEH along at 25MPH in EV. New high of 12.6 amps - over 4kW!