Cirrus SR22 Pilot Operating Handbook page 226

Section 7 Cirrus Design
Airplane Description SR22
28 VDC for the digital instrument operation is supplied through the 2-
amp ANNUN / ENGINE INST circuit breaker on the Essential Bus.
Oil Warning Light
The red OIL warning light in the annunciator panel comes on to
indicate either high oil temperature or low oil pressure. The light is
illuminated by a switch in the oil temperature gage/DAU if the oil
temperature reaches 240°F or if the oil pressure drops to 10 psi or
less. If the OIL warning light comes on in flight, refer to the oil
temperature and pressure gages to determine the cause. Typically, low
oil pressure will be accompanied by a high oil temperature indication.
The light is powered by 28 VDC through the 2-amp ANNUN / ENGINE
INST circuit breaker on the Essential Bus.
7-52 P/N 13772-001
Revision A5