M-Tdi questions

Hey all!

I may be coming across a bargin of a mental M-tdi set-up and have a few questions about the install. I'm new to derv conversions so bare with me!

How simple is it to wire in a rev-counter. and can I use a mk1 derv one? Or does it need to be the clocks out of the car its coming from?

What needs to happen about Glow plugs? Do i need relays, or a manual switch?

And lastly. Fuel tank and lines. Do i need derv/new ones and where do filters go etc?

Thanks
Rich

Oh and also.

What shafts do i need to use with a mk3 tdi box?

Thanks