is the oil pressure sensor bad when its not giving any oil pressure in the gauges

 

Maybe, maybe not! What if you don't really have any oil pressure. Check with a test gauge.

 

OK we change the oil pressure sensor and still the same
so im gonna see if my oil gauge is bad

 

Either test it with a real gauge or you might as well put a brick on the accelerator pedal and walk away.

 

can it be the gauge that doesnt work

 

Of course but that is only wishful thinking - put a test gauge on it before the engine is damaged.

 

I'd agree with Lesmyer. Before running the engine any more, get a loaner test gauge from the auto parts store and put in place of the oil pressure sensor. Then run your engine and read the test gauge. You don't know which direction to go until you do the things that will be known good (or bad). The test pressure gauge takes all electronics out of the equation and you'll know for sure or not if your oil pump is working. If it is, then you can start addressing a possible cluster or wiring issue. But check the pressure before doing anything more. Very important.