Re: 94 crossflow tack install
You can use your own wires -- provided you know what you are doing. If you have a side control box, look below the key and you'll see a connector. Thats for the tach. Crimp ring terminals on the tach end of the three tach wires. Forget the lights for now. Attach those wires to the tach and route the other ends to the connector on the engine control box. Crimp or solder males pins to each wire and slide them into the mating holes in the connector. Not perfect solution but it will work until you locate the actual tach harness. Try here on iBoats or Cabela's. I know they have them. The light can be connected to one of the other light terminals on whatever other instruments you have.