Cirrus SR22 Pilot Operating Handbook page 408

Section 9 Cirrus Design
Supplements SR22
providing full-time recording of critical engine performance
parameters.
The Engine Instruments system is powered by 28 VDC supplied
through the 5-amp Engine Instruments breaker on the Main Bus 1.
Refer to Avidyne FlightMax EX5000C Pilot's Guide for a more
complete description of EMax Engine Instruments, its operating
modes, and additional detailed operating procedures.
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Revision 01: 12-15-07