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so now all the prep is out of the way i turned to the engine wiring. firstly remove the engine plastics then the accelerator cable unplug and remove the isv unplug the connectors on the throttle body 6mm allen socket gets the four allen bolts off the throttle body, remove the body , 6mm allen bolt on the side of the manifold which holds the earth bracket and one again into the back of the head remove these. 6 x 6mm allen bolts that hold the front of the manifold on remove these disconnect the oil breather pipe on the right hand side disconnect the air temp sensor on the right hand side disconnect vacum pipe on the right hand side the manifold can now be removed. while i was at it i had an old metal rocker so i painted it to match the obd 2 one just so it look neater this job takes ?? 10-15 minuets engine bay looked like this with rocker removed get the obd2 engine wiring harness and familiarise yourselves with it, its going to be manky and oily i removed the multi pin conector from the metal housing as i wanted to paint it and it was manky i then removed the fuel injector plugs one at a time and replaced with the obd2 plugs one at a time. i used the vr6's fuel rail and injectors from the obd1 set up. again unplug the blue and yellow temp plugs from the housing and pull the loom out from under the coil pack around the back of the head and it should all come away quite nicely. plug in the obd2 plugs from the end of the fuel rail relocate the loom all the way around the head and place the multi pin connector back in the housing (i did this with the housing removed from car 3x 10mm bolts) at this stage you should replace the rocker cover and refit the manifold the loom then will be easy to put back into place connect up the obd2 throttle body and make sure all the plugs on the obd2 engine wiring loom are plugged in and everything is nice and secure. double check you have the accelerator cable guide on the inlet manifold. you can refit the cable now if you like its an easy task. now the best bit get the new and improoved obd2 chopped up loom but the loom hasnt been taped up yet?? i know its a ball ache but i think this is the best way as there are a few plugs still left on the loom which you dont know you might use and a dummy run just to make sure everything works is justifiable, pass the obd2 plugs through the bulk headand dont worry they only plug in in certain locations due to the way the plugs are deigned!! now the important bit all four plugs are in the fuse box. the white wire with purple tracer (this is the speed sensor wire) on the inner corrado loom needs to be connected to the golf loom (same colour wire) this bit of wire will need to be extended by about 6 inches. i cut the plug off of the corrado loom that we took out of the car, and added it to the golf loom, this then just plugs in nicely. look for a twin yellow plug it will have a grey wire with a white tracer and a yellow wire, the golf loom will have a grey wire with a white tracer, this needs to be connected to the grey wire with the white tracer on the corrado loom this connects the obd diagnositcs PLEASE NOTE IF YOU ARE CONVERTING A PREVIOUSLY AUTO CAR THE GREY WIRE WITH WHITE CHASER STARTS AT THE BLACK CONNECTION BLOCK BEHIND THE CENTRE CONSOLE WHICH IS CLIPPED TO THE METAL PLATE THAT THE CONSOLE IS SCREWED INTO. THIS WIRE WILL BE CASED IN A BLACK PLASTIC SHROWED. TRACE THE WIRE FROM HERE AROUND THE SHIFTER ACROSS THE CENTRE TUNNEL INFRONT OF THE DRIVERS SEAT , ALONG THE DRIVERS SILL AND IT WILL TERMINATE IN THE AUTO ECU MULTI PIN CONNECTOR ON THE DRIVERS SIDE WALL BEHIND THE BONNET PULL. TAKE OUT THE WIRE FORM THE MULTI PIN CONNECTOR AND CONNECT IT TO THE GREY /WHITE WIRE FROM THE OBD2 LOOM THAT STICKS THROUGH THE BULK HEAD. the big fat red wire with the blue tracer on it that comes through the bulk head on the obd2 loom needs to be plugged into the top right hand side of the fuse box the blue wire with the white tracer also has a blue plug on it this needs to be plugged into the small block of four connectors attached to the front (top) of the fuse box again this wire might need to be extended ok with everything connected in the fuse box double check and make sure you have plugged everything in on the engine side of things this is ready to fire up now , make sure nothing is dangling in the way of anything in the engine bay connect the battery back up . turn the key listen can you hear the fuel pump? do the relays click on turning the ignition on? can you hear the throttle body make a humming noise? good fire it up so its running all thats needed to do now is to tidy things up lets start with getting rid of this get rid of these the yellow one can go with this done you can start wrapping the loom i used self amalgamating tape 2 x rolls cost £10 i started with the plugs down by the starter motor and worked my way back to the fuse box yes the loom was still in the car as i wanted to get the loom back into the most original position i could... top tip start at the plugs by the starter motor and work up to firt join. then start from multi pin plug on engine loom and work back to first join then wrap the joint and continue up to the 2nd join work from th eecu plug back to 2 nd join and then wrap that join ....you get the idea . right so by now you might have already put back in the master and slave cylinder , this is ok if you have , the self amalgamating tape pulls the loom quite tightly together and now you have stripped out the crap it also makes the loom quite skiny so starting from the engine bay side wrap up as much of the loom as you possibly can even if you gently pull the loom through the bulk head until it wont go any further, then go in side the carand pull the loom back into the car wrap the loom in there and you will have then fully wrapped the obd2 loom place the gromet over the loom stick it in the hole and job done! replace all interior plastics and use existing cable ties to hold firm the loom in original position and your done enjoy your conversion! please feel free to add to this thread as my train of thought isnt exactly normal!! hope this has helped somebody out there..