Make sure the oil is full. start engine with hood up stand outside of truck and lisen for any knocking or irregular noise. if noise is heard then shut truck off and you will probabley need a new oil pump but if no noise is heard try changing the oil sending unit. the oil sending unit is the switch that tells the gage what pressure to read. its located near rear of engine passenger side, should be a single wire connector black in color. a easy way to look for it is to buy the switch then open the hood and look for it using the new one as a guide
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