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I picked up a 79 a couple of months ago and the previous owner said the temp gague never work since he had it. After I pulled the console and instrument cluster, I found the circuit board on the back of the cluster had a broken wire - probably from this guy putting in a new radio and jamming the cluster back into place. The plug that powers all the gagues and their lights plugs into the back of the cluster. It takes off behind the tack/spedo panel after that.