68 Barracuda........ Temp and Gas Gauge Issue.

Yes it does. Unless some snuck another one in there somewhere..... Does the oil pressure seem reasonably accurate?

So have you checked at the end of the temp gauge lead for the pulsing voltage? You should see the same at the end of the fuel sender wire. If you have the pulsing voltage, since the temp sensor is in spec, then likely the temp gauge is not good. If no voltage, then the traces/wiring within the cluster have some problems.

Also, read the resistance into the fuel sender with what you think is in the tank.