help identify wiring on vintage sun super tach

[musclcar]

i've got an older vintage sun super tach and have no clue what wires go to what so i can hook it up in my camaro .the sun super tach has a white needle pointer and the words super tach II are outlined in white it has red,blue,green and black wires and the red wire is labeled "tach" and the blue wire is labeled "G"

so if anyone knows these sun tachs i would appreciate some help

thanks