mechanics; What is the sending unit on a 93 jeep cherokee?

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squirrelly girl

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My oil light is stuck on, but my truck has plenty of oil & is not loosing power, tapping or ticking. Someone said it's the sending unit. I would like to know what this is... Is it just the sensor light? If it is & I don't replace it immediately will it damage my truck? Does the sending unit effect the truck getting the correct amount of oil or the oil pressure?
Thanks Guys!
 
The sending unit screws into an oil galley on the side of
the engine block below the exhaust on one side or the
other and works as a ground to turn light on,I agree it is
bad or you have a grounded wire going to it.
most times if it is bad it will be leaking oil from it.
 
The oil pressure sending unit is an electrical switch that is activated by the engine's oil pressure. When you turn the key on, but don't start the engine, there is no oil pressure, the switch is closed and the oil light on the dashboard lights up. When the engine is started, the oil pump makes oil pressure and opens the switch, and the oil pressure light goes out. The sending unit switch is probably stuck in the closed position, causing the light to be on even if there is oil pressure. Replacing the sending unit should solve the problem. The part should cost about $20 and can be replaced in less than 15 minutes.
 
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