From the Factory Service Manual, you can get one relatively cheap from
www.promanuals.net. Here is a link to your
2004 Dodge Ram Service Manual.The power steering pressure switch is installed in
the power steering high-pressure hose (Fig. 9).
(1) Disconnect electrical connector from power
steering pressure switch.
(2) Place a small container or shop towel beneath
switch to collect any excess fluid.
(3) Remove switch. Use back-up wrench on power
steering line to prevent line bending.