Lpg is a simple system. Find the main ecu for it that is attached to the lpg injectors & petrol injectors. Remove the ecu & wiring. You should be able to just disconnect - reconnect the fuel injectors. Remove the switch from the dash, also find the 12v & ign. feeds from the switch. Disconnect from the lambda exhaust sensor, (probably a solder joint). Disconnect from the cooling system, you may need a couple of hose connectors & clips if they cut the originals to put the t's in to feed the evaporator.
Put it all in a box with the evaporator & hoses & send to me for fitting to mine

I can send you an inlet manifold if you want one rather than blocking the jets. The tank I assume is underneath where the spare wheel should be. It is held in place by four bolts. Just cut the pipes if you cant be bothered to undo them. Simples!