None of the dash gauges work on my 1994 jeep

SOURCE: none of the dash gauges work on my 99 jeep Cherokee

remove the cluster clean contacts with dielectric spray then apply dielectric grease to connectors and reinstall if this doesnt help you need a cluster

SOURCE: ac/heater fan switch problem on a 2006 jeep commander

next to the fan motor there should be a connector that has three or four wires that attached to the blower resistor. it should have two screws holding it to heater case, just pull it out and replace.

Testimonial: "This info was very helpful but need a little more info of where the fan motor is located. I will post another question to find that info."

SOURCE: 2001 Jeep Wrangler heater blower stopped working

Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.