To test if the wire is the correct one , have a someone in the car with the ign on but not start and with the wire do a quick but solid earthing to the bare metal on the engine somewhere, the oil light should come on while the wire is earthed.
I should know the wire colors as I had to do a full strip and trace of my loom not long ago. Temp wire is white/red tracer and starter wires are usually black, black/yellow maybe..
Good luck fixing the problem