I got the tachometer working the only problem is I can't find the dimmer switch.
where can i find the dimmer switch to connect my tachomter's white wire so my tachometer backlight will work?

or where did you connect your white wire for your tachometer's backlight?

P.S.
the red wire that I ask before worked so thank you.

 

The light fuse under the dash

 

thats not switched. its constant power on my car.
I knew because I used to connect my red wire power source and it wouldn't turn off when my ignition is off.
I don't know why so I rewired mine to the lighter wire(behind your cars lighter)


I still need help with the dimmer
please help

 

help anyone.
let me know which wire color should I connect to light up my tach at night?
or I need to know where the dimmer switch that will be connected to my tachometer?

 

what kinda car is again?

 

The dimmer switch should be on the left side of the steering wheel. Pull it out and ther will be three wires 1 red 2 black 3 red with black. Tap into the red with black wire.

 

You can also find the dash lighting fuse, and wrap the wire around one side, stick the fuse back up in there.. and you have light.

 

found that red and black wire. its exiting out of the fuse box to the left of the steering wheel
works perfect right now

thank you all

 

If you go and look on like 12volt.com or whatever it is for the dimmer wire for the radio and just tap off that that could work as well, I dont know just an idea.