Baja Precion de Oil from Chevrolet Tahoe 2007 5.3

I turned on my truck and marked the oil pressure in 0 turned off and turned it on and it remained the same to a mechanic and changed the oil pressure valve and worked normally as a week was all good until I turned it back again and again with the same oil pressure in 0 Only as crazy they were seen to see if it was a computer error and it does not have any error changed the oil pump and when they took it out it was grated but no longer marks in 0 but it is kept in a room and when accelerated it does not pass the half and also the clock goes crazy and goes up and goes down only very fast please I need help with this we have taken it to the concessionaire and do not get the fault

When do you say valvula for oil pressure, do you mean the pressure sensor? this one in the photo?

I do not think the problem is pressure, to eliminate any doubt you must take out the sensor and place a pressure of pressure and measure directly leaving aside the instrument panel, do it with one of these.

The manometer is installed in the scheme in the place where it marks 706.