Which wire for tach light hookup?

[Mark]

OK, which of these underdash wires do I tie my tach light power wire into to power it up when I turn on my dash lights?
Anyone?

 

[cbfomoco]

what year?? I belive most lights on ebs ar a blue wire with a red stripe. look at your dash lights if you have them and the light on the auto shifter if it is auto. hope this helps and sombody else will chime in. But i would guess Blue with a red stripe.