help with tach install

[Deamers87ford]

where is the tach test connecter on a 91 4.0 ranger i had it hooked up to tan/yellow wire going into instrment panel but its not working also my tach has a black green red and white wires what are they all
black ground
green signal
white light power
red?
its a autometer

 

[Deamers87ford]

never mind got it guys