I have a 89 f150 300-6 with a 4 speed. It has the speedo and tach with the 4 gauges to the left (temp, gas, oil and volts). The gas gauge and the oil pressure gauge work fine. The volt and temp gauge do not work. They are swept to the left, the same as if the key is off.
My question is are the gauges grounded individualy or as a set (left and right) or is the whole cluster grounded together? I figure that would be the first thing to check i am going to take the whole cluster out and see if i can find anything

 

Diagnose one at a time. If fixing one fixes the other, then you'll know they were the same problem. But you can't diag 2 at once, and I doubt these are related.

Pull the R/W wire off the temp sender, ground it to the engine, and turn the key to RUN. If the needle moves, replace the sender.



If not, pull the cluster and polish the contacts on the film circuit and the connector terminals with brown paper or a pink eraser. Plug it back in & try again. If it still doesn't move, unplug it and test each ground & power wire using the wiring diagrams in the back of Haynes. Try to find an OLD edition since the current one has deleted a lot of info.