Gasoline guage wiring

[acrawley]

My 1983 50HP Mercury Outboard's gasoline guage was missing wires and did not work when I bought the boat. The guage has a GND which I assume is the ground, then an S and an I does any one have a wiring diagram that would allow me to connect the guage so that it will work?

[boatmangc]

S = Sender- from the fuel tank, usually pink
I = ignition- usually purple from the keyswitch