You will need an old style starter solenoid, and a short piece of battery cable terminated with 8mm rings at each end.
For simplicity, i fixed my solenoid to the lip of the front panel just in front of the starter, this eliminates extensive moving of the wires. the cable that comes from the battery goes to one of the larger terminals along with the other brown wires for power to the fuses etc and from the other large terminal on the solenoid, the new short HD cable goes to the starter.
then all you need to do is connect the wire from the start relay that energised the pre engaged starter to the small spade terminal on the solenoid and as long as you have a good earthed fixing on the solenoid, all should be good to go.
If you place your solenoid in the same place as me, remember to shield it from splashed water and rain.
here are a few pictures of mine for you.
A general shot so you can see where everything is.

and a couple of angles for the connections.

Edited by customcart, 15 June 2010 - 10:21 AM.