Oil sending switch

Where is it on a 2000 Express 2500/5.7
My gauge stays pegged when van is on or off.

My info shows it is located here.

Thank you.....found it unplugged it and replugged it and the gauge seems to be working.
Whats should the pressure be normal at idle and say 2000 rpm?

Electric gauges are ony indicators and do not always show true oil pressure.
To get true pressure a manual oil pressure gauge needs to be hooked up
Old rule no one is 1\3 to half gauge idle and 3\4 gauge running on road.