Tach Outout....need help finding it...

Im installing an MSD ignition on my 1990 CRX SiR, however I cant connect this wire from the tach output on the MSD box to my gauges where it should hook up to because i cant find the tach output connector in my car......I'm hoping someone has installed an MSD box before and knows what Im talking about here, and may know where this tach output wirre has to hook up on a CRX (i think its near the gauges).......because its this one green wire i have to connect that wont let me start the engine because i guess it needs the tach output wire to be hooked up. Any help would be great, and an explanation on what exactly the tach output wire does would be awsome!!!.......

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The tach output is for an aftermarket tachometer or a shift light or any place rpm out is needed. You can connect the "magnetic connector" for a simple ignition kill switch. I forget which of the 2 wires used but it's simply connected to a single pole switch to ground.
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