I converted two cars to LPG back in the 90s. The Land Rover 90 was very straightforward as it ran on carbs so a fully manual setup was installed, just needed a saucepan size vapouriser plumbing into the cooling system located in the engine bay and a mixer plate between the carb and the inlet manifold. Few switches and solenoids, the tank and piping and it was in and working. Installation took about a day and then I paid to have it certified, all in the cost was around £300. Swapping the Landie for a Range Rover (injected) I wanted that converting too so I found a kit with two ‘torpedo’ tanks under the sills. The EFI needed to be tricked into thinking there was fuel pressure in the petrol injectors so a cheat box was needed but that also had the benefit of starting the engine on petrol and then you had a choice of switch over conditions based on either time or revs, I chose to switch to gas at 1700rpm. Total install was around £800. Both installations broke even within a year and gave no problems although searching for LPG was a bit of a faff.

Last edited by Grumpy2; 26/03/24 08:50 AM.
2012 Plus 4 in Sport Green. Much comfier than the Plus 8!