In the UK DIY installing is allowed. Your insurance may require a inspection certificate or uklpg registration.
You must notify your insurance but it is not considered a modification.
Dual fuel is only normally used on diesel engines. Petrol engines are bi-fuel allowing you to switch between fuels. With a carb engine you will normally start on LPG and just let the engine warm a little before pulling away.
Cost for a fitted conversion allow between £800 and £1200
For the filler I normally mount it under the rear bumper so you can fill from either side and save drilling the wing. Switch on late 140 I fit it to one of the switch blanks or on early cars into the center console. I have hidden one switch in the ash tray!
As to installers I suggest speak to a few and pay them a visit.
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