Voltmeter & gas gauge inop (never goes pass 1/4 tank even when full), temp works but is inacurrate (sometimes reads 160 even though car was just started), oil pressure gauge works when car is first started but then stops working, any suggestions, I have replaced the complete dash.

 

fuel sending unit is toast.. bad part is its in the tank or the float is just stuck.. as for the volt meter check your alt wires could be loose that causing the problem. wireing gremlins gotta love them