After my mate puting the gearbox back in, i have found this lose plug under the engine bay. Right now the car wont start but i think that it is due to a dead battery because i had it started 2 days ago.
I dont think it is the speedo cable, as the speedo still works as does the rev counter. There is a strange light came on, on the dash. If i remember correct is a Amber circle with a triangle inside then a exclamation mark inside that. (i might be wrong though)
My mate is now on holiday and im wanting to try and get the car back on the road asap.
Heres a pic of the Plug. The wires are Brown, Black & White.

The wire on it cant really go far.
This bit is hard to describe but i'll try my best. The bit that the plug goes into would be 3 pins and this would be the female end.