Onan 25.0 DEH-53R Series Operator's Manual And Parts Catalog page 13

ENGINE SENSORS
Resistance units and switches in the engine
temperature and oil pressure monitoring and shut-
down systems are sealed units and are not repairable.
For location, refer to Figures 5 and 6. When replacing
a sensor, do not substitute, use recommended items.
Resistance units are matched to the gauge they
supply, and cut-off switches are close-tolerance
actuation parts, made for a specific application.
O I L PRESSURE
SENDER ^
FIGURE 5. OIL PRESSURE MONITORS
T E M P E R A T U R E
SENDER
j (RESISTANCE
UNIT)
WATER
H I - T E M P E R A T U R E
C U T - O F F SWITCH
(HETCO
FIGURE 6. ENGINE TEMPERATURE MONITORS
s