New gauge install

[Fire Rider]

Ok, first truck project 68 step side, but probably the first of many post. I have changed from idiot lights to full gauge cluster, I re-wired the harness and here is what I have.

Dash lights come on with key and stay on
Oil pressure gauge is maxed out on high
Temp stays in the middle
Amps stays in the middle
Fuel gauge is showing way past full, almost another half tank
Tac works fine
Speedo works fine

Where do I go from here? Do I need a different oil pressure gauge? Do I need to replace the fuel sending unit, it worked fine with old gauges? Do I need to convert to a volt meter? All help is appreciated.
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[Andy4639]

Are u sure u reconnected all the right wires. Did u ground the dash back down with a extra ground to metal dash someplace?
Is this what u used to swap it over.

[Fire Rider]

I am 99.9% sure that I got them swapped over right as I numbered all of them as I took them out so that I wouldn't get them confused. I have work on cleaning some of the connections and have drove the truck some which has helped me get a better feel for how the temp and amp gauges are working. The fuel gauge is still showing that I am almost a half a tank past fuel and the oil pressure gauge is buried on H (I assume the high volume oil pump is the cause, the truck idles at around 30 psi when hot and 50 psi when you first start it up). I have an after market oil pressure gauge under the ash tray so if I could get the fuel gauge figured out I would be thrilled. I am planning moving the tank from behind the seat to under the bed in the next 2-3 weeks which requires a new sending unit, should I wait before hooking the new sending unit up?