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SOURCE: WHERE IS THE OIL SENDING UNIT LOCATED ON A 93 FORD TAURUS
The oil pressure sending unit is located behind the oil filter.
SOURCE: location of the temperature sending unit on a 1991 olds toronado
Ok, you have three sensors on this engine that work together to manage the temperature reading that are sent to the gauge. i recommend checking all three to be safe. i will list the sensors and, locations below.
1. Coolant temperature sensor- Under hood, driver side, upper engine area, above
transmission bell housing, mounted in driver side
end of intake manifold.
2. Engine Temperature sensor- Under hood, driver side, upper engine area, mounted
on rear cylinder head
3. Temperature switch.- Under hood, center, lower engine area, above oil
filter, rear of coolant temperature sensor, mounted
in engine block
SOURCE: location of temperature gauge sending unit 1990
Check at thermostat housing or right behind it.
SOURCE: E150 ford 4.9L motor water
This is on a 1990 E-150 4.9L did not know your year ?
The coolent temperature sensor/switch (For Computer) is Top forward RH side of engine, under water outlet...Hope this was some help to you ?? 
SOURCE: Where is the speedometer sending unit located 1993 ford f250 XLT 4x4
My parts book shows a speed sensor in the side of the transmission where the cable used to be.
CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles. 
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