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Oil sending unit


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You can install a pipe T to retain the OEM function & give a tap for an after market guage.   I used to see this often on flybridge cruisers with 2 sets of guages (upper & lower) stations.   The "sending unit" was actually a variable resistor to ground...  power was fed from the instruments to the "sender".  There were some that had the same resistance values & others that were not.  No master list I'm aware of.

Eventually, I've had sender diaphrams fail & leak oil...  The switches don't usually leak but can still fail. 

The oil light switch is just a grounding switch.

Edited by flagmanruss
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