Found a new problem.... factory gauges not working

[powerstroke2501997]

So my oil pressure gauge, volts, and temp aren't working, fuel gauge does but only goes to half a tank think its the sending units. But why aren't the other three ? I'm stumped

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[Jpm10indy]

I have the same problem with my temp and voltmeter. I dont know what is wrong with them but I would like to. The Voltmeter gauge will rise and go all the way to 18 volts as I go down the road but it just stays at the bottom after I start the truck until I am going then it slowly climbs to the top. Hits the 18 volt mark at about 30 miles.