can any one tell me about wiring? what i mean is can you have wires not hidden that got to a tacho or do they have to be hidden or have some sort of tubbing around them?????

They need to be insulated and they need to be out of the way so that you don't intefere with them accidentally.

Also, power lines need to be fused otherwise you run the risk of ending up with a fire.

Might be easier to answer if you could ask the question with a bit more detail?

you can get the tubing from supercheap, its best to use that as it make it all nice and neat.