Old Skool HKS Electric Boost Gauge Q.

[A-to-the-J]

For those of you still hanging on to your Old Skool HKS Electric Boost Gauges, I've got a small dilemma. Here is my Gauge:

The Bottom connection is for the Electric Sender Harness. The Top, I assume, is for the Power Harness. Red is 12V, Black is Ground. But what is the Yellow and Orange wires for?

help anyone?

 

[mattsplat72]

I would venture a guess and say daytime/night time illumation?
my prosports have
Red power
black ground
white
orange
green
I only connected the green and it is just red all the time

 

[projectsupra]

I believe orange is illumination, yellow is constant +, red is switched +, black is -. A quick test with only red and black wired and a multimeter will tell you if this is correct or not.