95CivicConv

Hey, I currently have a 93 Honda Civic DX. I just got it a few days ago and all i've done so far at the shop is put 2 1/2" in piping from the headers back and add a small muffler for a nice sound.

The problem I'm having is the DX didn't seem to come with a tach, so I bought an aftermarket one and installed it. There are 4 wires, black, red, green, and white. I put the black one onto a piece of metal to ground it. Red I attached to the red wire on my deck so it has power. Then I opened up the dash cluster and attached the green wire to the "blue" wire? I don't know if that's right, but it was the only wire that seemed to work. Now the tach works and all, but my problem is it won't light up when I turn on my lights. I attached my white wire to the light fade switch like it said in the manual, but there's 3 wires there. 2 red and 1 black. If i connect the white wire to either of the red, the tach doesn't work, but when I connect it to the black, everything works fine, but it just wont light up. Any ideas what I'm doing wrong?
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PLAN:B

This might sound dumb, but did you get a tach w/ a backlight? I thought mine had one and then I read the box. I was wrong.