AC Auctechnic Boost Gauge, how do I wire it, has 3 wires, red, black, purple

[Trelisong]

I won the Boost gauge off ebay and to my surprise it has 3 wires, I was expecting just a positive and ground wire.

There is a red, black, and purple wire. The only thing I could think of is possibly a potentiometer or something for dimming, I have some 10k potentiometers from a project I did in the past, but im really just not sure what the proper way of wiring this gauge is.

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[EagleTSIawd]

the black one is usually the ground, the red to a switchable 12v source and the purple to your parking lights

 

[Trelisong]

the black one is usually the ground, the red to a switchable 12v source and the purple to your parking lights

So black to ground, purple to parking lights.

switchable 12v source is a 12v source that gives power when the ignition is on right?

 

[RedTurboEclipse]

interesting it has 3 wire. the ones ive isntalled with 3 wires are the ones with multi color, and one is connected to CONSTANT 12v so it remembers the color you used when you turn off the car so its the same when you turn it on again, and the other is the switched power, to wherever you want, parking lights, external switch etc, your call.

 

[EagleTSIawd]

...switchable 12v source is a 12v source that gives power when the ignition is on right?

yes, thats right. You wouldnt want to connect it somewhere where it wont turn off, that would slowly drain your battery.

 

[Trelisong]

I got it wired up and it looks great once it lights up, however I expected a barb fitting that I could slip a vacuum hose over, instead it has a threaded fitting.

Does anyone know what I need to screw onto that threaded fitting. Also does anyone happen to know where I could order something like this? I checked eBay and found nothing.

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[Trelisong]

Ok I found something, I just hope its what I need. here is what I ordered:

fitting part # 5779K123 : http://www.mcmaster.com/nav/enter.asp?partnum=5779K123&pagenum=166

25ft. hose part # 5112K51 : http://www.mcmaster.com/nav/enter.asp?partnum=5112K51&pagenum=113

 

[Trelisong]

Well the stuff I ordered did not fit, going to have to go to some hardware stores and do a custom job because guessing at what I need and wasting money is pissing me off.