Wiring Innovate AFR Gauge help

[igotaRaptor]

Ok I searched and I may be wrong but I could not find anyone with this question. Sooo, that being said I’m installing an Innovate PSB-1 boost and ARF gauge that’s all in one does data logging even has a shift light you can program. All great. So question
#1 I need to get a tach signal wire so which wire on the injector harness is the negative? Purple seems to be a common color in the harness

#2 I need a headlight signal so I figured cool back of headlight switch will work so when headlights come on it will dim the unit. Is there a wire I can grab behind the dash or do I have I run a lead up to the headlight for this? I used a test light on back of headlight switch and I’m not getting anything from those wires which indicates it’s the headlight wire.

I looked around any help will be appreciated. I’m on my path to pro charging this beast

 

[igotaRaptor]

Would the coil be a better option for the tach signal ?

 

[The Car Stereo Company]

you can get this signal from the injector. its the uncommon color. meaning every injector on the drivers side has xxxx/xxxx same color wire and the scond wire is always a different color from the rest.
example.

red/green and blue/white
red/green and purple
red/green and orange/pink
red/green and black/pink

any wire not red/green would be the tach signal. REMEMBER THIS IS AND EXAMPLE. i dont know what the colors are, i dont know what gen your truck is, so the parking light wire to dim the guages is also going to be different

 

[The Car Stereo Company]

nevermind. just realized the is the gen 1 section. hold on.....

 

[The Car Stereo Company]

dont use headlights to dim the gauge. use parking lights. the headlight is a - signal so it wont work for you. parking lights are in the passenger kick panel. ********* box. cant miss it