I have a non-guage car (67 Coupe) that I am installing Autometer ultra-lite electrical guages into. Speedo, Tach, Water, Gas, Oil. Question is this : Can I use the original oil pressure switch wire from the engine harness for the new switch and pick up the other end of that wire from the original connector where it connected to the original dash cluster? Obviously I have to find another powersource for the guage lights but will this work? This way would allow me to use the connection from the original harness into the fuse block. Will it work and is this a good idea or not?