I have upgraded a few of the factory fit LPG cars to modern LPG systems.
To a fair extent they are correct in what the installers have been telling you.
As you are converting from CNG to LPG you will also need to replace the filler point. The filler can be fitted in by the petrol filler behind the flap as the cng one way
Switch can be fitted to one of the switch blanks
The factory fit electronics are not capable of controlling a sequential injection system as the factory fit system does not have injectors but a distributor much like the old mechanical Bosch K jetronic systems. As the factory fit cuts the petrol injectors you must have it in petrol mode for a modern system to function as it measures petrol injection pulse width and uses the signal as a trigger. Not saying it is impossible to use the factory LPG gauge but it would not be simple
There is a lot more wiring as the modern systems are much more sophisticated than what was used on the factory fits back then. Does not need to be messy.
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