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The wiring diagram is on the side: beside the plus-in-a-circle is a color (probably Bn = brown), beside the minus-in-a-circle is another (possibly Bu = blue). The other two colors (are they black [Bk] and white [W] ?)are shown connected through a switch to the minus-in-a-circle. One of the switches is closed, one is open; this represents the condition when the eye detects no returning light.
The plus-in-a-circle goes to +12V, via a circuit breaker. The minus-in-a-circle and one of the switches go to the digital input connector (or your circuit board. If to the digital connector of the RC, then the minus-in-a-circle lead goes to ground, and one of the other leads goes to a digital input pin (see your control system manual). I say one of the leads because both change on detecting light, so it is up to you which operation you want: 1 for light or 1 for dark. Try one, if you don't like it, change it.
I can't tell you the correct colors because the sensors were not in our kit, but I have one of last year's, and the colors are somewhat standardized in the industry.
BTW, be careful, they're not switches, they're transistors.
HTH
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