questions about a few wires

I am assuming from your post we are talking about the 68 Valiant.

The positive coil wire is typically blue and should have a ring terminal on it. The oil sender wire is typically grey and the senders from that time frame had a nail head connector so the connector on the wire should be a female spade. The water temp sender has a screw lug but the connector is a 90 degree bullet that presses on not sure of the color.