Gauge problems. Not reading right.

[84 400]

I saw Bow ties post but did not want to highjack it. I have one simmilar issue and another that is my own. All my gauges work. not well but move. I also have some lights out and it is really hard to read at night. i have read a bunch of threads about how to fix that. Okay my issues... My oil pressure gauge is up at 60 at idle and then when i start to acellorate it keeps going up. When the Rmps go down again it goes back to 60. and if you rev it it goes above numbers just like if you were acellerating. when the truck is trned off the gauge goes down to 0. Does this have somthing to do with the fact that i swapped the motor for a small block 400? The second problem has been occuring since the end of the summer. the Gas gauge goes crazy and gets stuck when i switch to the left hand side tank. it used to go way past full and come down but now it just stays on way over full and does not move. Maybe a ground issue? The gas gauge in this truck is the best i have ever had. when it is on the e the motor dies! it is very accurate.

Thanks for the insight, the truck is off the road till at least may and i would like ton figure this out.