GM-GMC: 1999 GMC Sierra, check oil level, gmc sierra

Question
How do I get the check eng oil level light to reset?  I had the oil changed and this light is burning now.  I have never seen it before I had the oil change and the engine checks full on the dipstick.  The people at the quick change said they reset the change oil light, but now I am having a problem with check oil level light.

Thanks

Answer
There is usually a sensor that is mounted on the oil pan that has an internal probe that senses OIL LEVEL in the oil pan. Either this sensor is FAULTY or whoever changed the oil, Accidently or possibly on purpose disconnected this single wire that just plugs onto the sensor connector.

Thomas