im installing a tach right now...im confused because i cant find the 12 v dash lighting(thats what the instrucitons said), i took apart my dash and still i cant find it...anyone have any pics or can tell me how to find it or even what the hell it is, thanks

 

You just have to wire it up some something with inconsistant 12V power. Hence you turn it on, it'll illuminate the tach.

Most of the time, you'll wire it up to your parking lights/headlights.