Wiring Question

[Bygracealone]

Hey guys,

I have one of those smart gauges that came with my 96 Johnson and it looks like this:



Okay, the back of the gauge looks like this (sorry for the blurry piciture, I tried to get as close as I could):



The wires coming from the engine that I think go to this guage look like this:



Anyway, here's the question. Do the ends of these wires simply plug into the back of the gauge as they are? Secondly, and definitely most importantly, how would I know which wire goes into which hole? The holes are numbered and the wires are all different colors. If anybody could offer help, I'd be greatly appreciative.

Here's another picture of the gauge. This one shows an additional purple wire along with an alarm. This is so confusing :-/



Here's a picture of my dash with newly installed gauges (though the smart gauge is not plugged in).



I thought I was given a speedometer along with the other gauges, but I've either lost it or never got it. So, I left the original one in along with the original water gauge, though I'll likely take out that gauge since the smart gauge will do the job...