65 no dash cluster, radio, oil, high beam indicator bulbs

First, check all the circuits at the fuse box with a test light to make sure you have power on both sides of the fuses. No dash lights at all is usually the light switch dimmer control or a connection on the dash circuit board cannon plug. The oil pressure light could be the dash bulb or the sending unit. Attach a jumper wire from sender wire to a good ground and turn on the ignition switch. If it now lights, it's the sender. If it still doesn't light, it's the bulb or circuit board connection. The radio power is on a separate circuit. The radio light should be ganged with all the other instument lights.