Volvo 850 Gas Plant LPG

Hi people, because of the ever increasing petrol prices and the high savings that can be achieved by an LPG system, I have become increasingly louder and plan next summer the installation of an LPG system. I want to install it myself, that has several reasons, on the one hand because of the costs and on the other because I have the appropriate knowledge as a screwdriver enthusiast and approaching car mechatronics technician and it trusts me especially because it runs coldly down my back with the thought that I have some retrofitter on the carouse snipple…….. however, I let them vote by a specialist. I want only to make the hardware. So much to my background, now comes the question, which manufacturers can you recommend to me and what costs the complete kit? How does it look with the service? With which brand is it best? Does someone already have experiences in terms of tank volume and range as well as consumption? How was the tank stun accommodated with you? How does this work with the TÜV acceptance during self-construction?