What you have Brad is a stock "mechanical" gauge which has had the capillary tube cut,
broken, ripped off by someone. This is a thin hollow tube that is when working is a
sealed system from the dash gauge on down to the sensor bulb. That stock sensor bulb,
screws into the seat in the left rear of the head is charged with liquid either under a slight
pressure. When it gets warm it turns to a vapor and puts pressure on the bourdon tube
which expands causing the needle to register the temperature. It's quite common for
the "sealed" line to spring a leak rendering the gauge inoperative. The only fix is to replace the
gauge with it's attached capillary tube and bulb with a new or working used gauge.
The blue "electrical" sender that you have pictured is a much later item and is used only
in conjunction with it's matching "electrical" dash gauge. You obviously bought the truck
with a non working temperature gauge and are confused why they are not compatible.
Once again, one is a broken Mechanical gauge unit and the other is a “12v electrical”
sender only, they don't, won't, can't work together. It’s like trying to marry a horse to a
snake.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 01/24/2013 7:33 PM.
