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Selecting the proper Sender
Senders are designated by the following descriptions and must be selected in combinations of one each from A, B, & C.
(For example: Single station, American resistance, Standard ground)
Notes:
a. Station: It is the sender that is unique in a dual station application. The gauge is the same in either single or dual
applications.
b. Resistance: Choose your sender to electrically match your gauge not just the manufacturer. Some sender
manufacturers make both resistance types; and, some instrument manufacturers may use either resistance type
depending on the gauge. There is usually no visual way alone to determine the resistance type.
c. Ground: Standard ground is the most common having battery negative (-) connected directly to the engine block.
Sending units may have one (1) terminal (signal). In a floating ground system, the battery negative is not connected to the
engine block so merely threading in the sender does not supply ground. Floating ground senders will have two (2)
terminals (signal & ground). Both sender terminals may be wired to the appropriate gauge terminal or the sender's ground
may be wired directly to the battery negative. A floating ground sender may be used in a standard ground system but not
vice versa.
Oil Pressure Senders
Engines or transmissions equipped with a low oil pressure switch that activates a warning light require an appropriate "T"
pipe fitting to accommodate both pressure sender and warning light. Most oil pressure sending units have 1/8"NPT pipe
threads and are usually mounted in the engine's block. If the block or transmission case has a larger pipe size, an
appropriate bushing may be used without affecting pressure- sensing accuracy.
Temperature Senders
Temperature senders are available from Faria® Marine Instruments in 1/8"NPT thread sizes. If your water jacket, oil pan
or transmission housing requires a thread diameter larger than 1/8"NPT, a bushing will be required. "T" fittings should NOT
be used as these may affect the accuracy of the sender by reducing the temperature signal.
English
a
A
Station
b
B
Resistance
c
C
Ground
Single
Dual
American
European
Standard
Floating
IS0334
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