4 wheel drive sensor or switch on transfer case

I HAVE A 1989 MAZDA B2600I 4 X 4. I NEED THE SENSOR OR SWITCH ON THE TRANSFER CASE THAT OPERATES THE 4 X 4 LIGHT. IT HAS 4 WIRES COMING OUT OF IT. PLEASE CALL IF YOU HAVE ONE 229-251-2914. THANKS DAVID