Help needed installing Air/Fuel autometer gaug

[8TurboT7]

I got the gaug from a buddy and I dont have any instructions on how to install it. It has 4 wires I know 2 are for the light so can someone help me as you can see I'm lost here. Thanks

 

[Boost231]

what model # is it? is it a WB or NB gauge?

 

[8TurboT7]

Its a Lunar gaug model NB