bro..... red is from direct supply 12V after fuse..... Then Orange is supply 12v from your any supply for light.
Due to smoke gauge, you need supply to light up a bit your gauge.......it's come from red wire. Then at night, when u turn on light, your gauge will more brightness.....it's come from orange wire supply.....
Erm...:hmmmm:
There's a question bout this wiring. Actually i jst bought a vac meter from OneUtama.( My old vacuum meter spoiled, white face type ) And i asked the shop assistant how to fix it( i knew i didnt ask properly, regret..). First, he say black as usual, ground wire. And then he say put the red to Light source power ( i assume tap cigarette lighter Light source ). Okie, this means... at nite when i switch on my light, the meter will lights up (true... nothing wrong). What if day time when no on light then the meter will be in no-light condition (cos the meter is smoke surface).
Now, after i read the manual and see wat Otromen said, i feel weird. Isnt it when day time, the meter should have BRIGHT enough to let user see, and when nite time when user switch on light, it should have dimm abit due to distraction. Am i right? cos this apply to my car audio player too..when nite switch on light, the light source on cd player will dimm.
So, from the manual it says :
Orange -> connect to 12v lighting
Black -> connect to good Ground
Red -> 12v ignition switch (+)
Means, how should i mess with the orange and red wire. Which i should tab for the "at nite open light source" and which should be "when on car always got light source"
this both source which should be suitable, but as i see from others thread, 1 should come from cigarette lighter source. How bout another wire source??