Dash guages all stopped working & blower motor switch stopped wo

I'm assuming this has dual tanks, do you know if it is not working on both tanks ?
Most people would check the circuit for the gauge at the tank. The sending unit grounds the gauge on the dash.

There is a cable that runs from the back of the transmission to back of dash.Undo cable at trans end.Spin the inner wire with cordless drill,speedo should move,if not replace speedo cable.Some cables u can pull inside wire from trans end,so don't have to mess with dash

I would start by checking all the fuses, then check the headlight switch,test it for power as you did the tail light, then check the wiring coming out of the cab down the frame to the rear of bed check for a short but if all fuses are good then will not be a short, may be a bad switch and the most important is the bulbs, make sure they are good.

The blower resistor needs to be changed. It is located on the blower housing under the dash on passenger side.

Trace your wires from your heater. Check your fuses also, the heater wire likely shorted into the ground for the gauges or vice-versa. You have to have some wires rubbing together under the dash somewhere.

it's inside the fuel tank. i believe you've got to drop the tank on this vehicle as there probably isnt a service door on your truck bed.. you would also be able to get at it by removing the entire bed.

check the fuse first,then the motor for power,then the blower motor resistor

I'm betting they are different lengths and different size u-joints,

blower motor is normally on passenger side under the dash and the other place is under the hood on the passengerside also up against the firewall if there is a library near you you can get information from there for your truck but if it stopped working altogether the relay in the blower fan is gone

this is not a problem with thw switch or motor. There is a resistor that is mounted inside the dash on the pasenger side that controls the speed of the blwer..these have a tendency to burn up after 10 years or so... replace the resistor, and you will be fine!  http://cgi.ebay.com/ebaymotors/Toyota-Truck-A-C-Heater-Fan-Resistor_W0QQcmdZViewItemQQcategoryZ33548QQihZ016QQitemZ260344846266QQrdZ1QQsspagenameZWDVW#ht_500wt_1230