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you are in for a surprise! no sending unit on your truck, there is a pressure switch set at I think 6 or 8 psi, once this is met the ecm sends a voltage to the 5 volt full scale oil gauge to make it look like about 45 psi. below this level, the gauge drops to zero. remove the switch and plumb in a T and re-install the switch and add a mechanical 0-100 gauge
 
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