lpg tanks usally work of a float mechanisam just like ur standed petrol tank so i guess who u where talking too were thinking or some sort of pressure sender.u should be able to get a gauge to match the sender already in the tank try ashdowns or ingrams if urve got em where u are. u'll probley need to measure the ohms resistence of ur tank sender when at full and empty.

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Yes you do need your lpg ticket for work on the high pressure side of lpg. u can work on the low pressure side with out one and i think u may be able to work on the electric's without one but not sure on that one mabey someone with there ticket can clear this up, beattie do u have a ticket or know if u can work on the electrics??