I just got an HKS peak/hold boost gauge and I need some info on the wiring and hose connections.

Some of the wiring is obvious, but I'm not sure about two wires:
black = ground
yellow = backlight
red = battery-positive(?)
orange = ???

Also, it has three vacuum line nipples... anyone have any idea why it would have more than one, and what the other two are for?

I can't read Kanji, or this wouldn't be an issue.

I looked on http://hksusa.com/ and it looks like they don't even list this unit any longer. I couldn't find an email address to contact them, and I'd rather not bother them on the phone for a product they no longer manufacture (last resort).

 

In case anyone is wondering: (and in case anyone stumbles over this with a search later)

Black = ground
Red = switched hot
Orange = unswitched hot
Yellow = backlight hot

...and for the sensor:

Blue = IN (signal)
Green = G (ground)
Yellow = 5V (out)

Oh, and what looks like vacuum hose nipples are actually the strangest banana plugs I've ever seen.

 

i hooked mine up using this color code... and the needle bottoms out to the bottom of the vaccume side. ummm weird.

are you sure this is right? where do i ground the green? does it matter?