glow plugs for 200tdi

i need some help
i am in the process of putting a 200tdi engine and box out of a disco into my 1985 range rover classic
could someone tell me or send me instructions to wire in the glow plug timer please
i have had a look on the disco theres is five terminals on the relay (4 large 1 small) one wire goes to the glow plugs and one goes to a permanent live feed can where do the other three terminals link to
thanks to anyone who can help

Save yourself the trouble - a 200tdi does not need glow plugs in the UK climate,if it wont start without them something is wrong.

If you DO want to put them in, then wire them into a push button in the cab, whats the point in having glow plugs when you have only stopped for a bit after the engine being on for a while.

I have manual glows, and can glow the engine in the morning, and then if kept in use regularly, or on for long periods, not need to again. Saves time, battery power, and the glows.