Where is the oil switch interruptor located on a 2007 chevy silverado 5.3 engine?

Question edited for clarity.
Question moved to model category.

If you have a 4.3 or 5.7 Litre engine (Silverado Classic Body Style), it is mounted on the back of the intake manifold in a brass fitting just under where the fuel lines come up from the transmission bell housing.
Jun 4, 2013

I have a 2007 chevy silverado and need to replace the oil ...

It is on passanger side of engine, in front of the oil filler tube. Round looking thing, five wire connector plugged in !

Hello: The oil pressure sending is on the top of the engine at the back, you can hardly see it. to replace it you have to remove the intake manifold.

double check for leak at rear of engine where engine block mates the transmission .the housing for the rear seal is bad about leaking on these engines at 100,000 miles

If you are lucky , replacing the oil pressure sender unit will solve the problem. Your truck might have perfectly good oil pressure , but a bad sensor. OR you might actually have low oil pressure , which is not good , and will be expensive to fix. Good luck.

The "Change Oil" message displayed on your Chevrolet Silverado's gauge cluster is part of the Oil Life Monitoring System, standard on many GM (General Motors) vehicles. The message appears when it's time for an oil-change; the interval is based on your driving habits (for example, it may appear more frequently if you engage in a lot of stop-and-go traffic). Once you change your Chevy's oil, the message will not disappear; the system must be reset. The process is a bit different between Chevy Silverado models.
jQuery('.intro .thumbnail').each(function(i,e){ jQuery(e).find('img').one('error',function(){ jQuery(e).remove(); }); }); Difficulty: Moderately Easy Instructions

2007 to 2010 Chevrolet Silverado
1. Step 1 Insert your key and turn the ignition to position "C" (Run/On) without starting the engine.
   
2. Step 2 Press the second button from the top on your information center (next to the steering column, car symbol) until "Oil Life" displays on your odometer cluster.
   
3. Step 3 Press and hold the "Reset" button on your information center (check mark symbol) until the "Oil Life" display changes to 100 percent.
   
4. Step 4 Turn your ignition to position "A" (Lock/Off).
   
2002 to 2006 Chevrolet Silverado
5. Step 1 Insert your key into the ignition, and turn it to position "A" (Run/On) without cranking the engine.
   
6. Step 2 Depress the gas pedal three times within five seconds. The "Change Oil" message will begin to flash.
   
7. Step 3 Turn the ignition to position "A" (Lock/Off) once the light stops flashing (about 10 seconds).
   

You probably need a oil pressure sending unit it is located at the back of the engine and is a high failure

OIL DRAIN PLUG IS ON THE BOTTOM SIDE OF OIL PAN.

the oil sending unit is located at the back of the motor right below the rotor cap it is about 3 inches long and has a 3 wire plug hooked t it

There are 2 both located in the block..