They're usually located near the oil filter. Here's a link to what yours looks like. http://www.autozone.com/autozone/parts/2005-Chrysler-Pacifica-2WD/Oil-Pressure-Switch/_/N-jmu55Z8znc6?filterByKeyWord=oil+pressure+switch&fromString=search
A forum community dedicated to Dodge, Jeep, Ram, Chrysler, AMC owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!