Dont you hate it when you stuff up !!! Factory fitted LPG TJ 3.5 Magna 2001

Just pulled out a old car phone kit and pulled off the connectors for the LPG.Petrol switch.

Now can not work out which is which.
I have three wires one to a black connector that is a wire out of the switch (that's ok)

Left I have two wires, Red and a Black wire and three spade terminals marked 1 2 3

As the petrol gauge is set up with these i need the right combination

Cheers in advance