Tachometer

I bought a small tachometer that goes between the radio and instrument cluster. It works but the light does not work. Could someone assist me in wiring the light to work? I have a gray and black wire coming out of the back of it what do I connect it to? It is a mini tach. Thanks
 
I think you will have an owners manual in that it will be mentioned clearly try to fix it as they said in the manual then every thing will be fine don't forget to look at the wiring diagram it is the main thing you should have to do all the best.
 
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