what color of the wire do i hook up the tach to? the wire that makes the
pointer move? help please

According to my trusty Haynes manual, you will want to attach it to the blue wire coming off of the ignitor in the distributor.

i have a 87 civic and i put an aftermarket tach in. there were four wires coming off of the tach; black, red, green,and white. i put teh green through the hole in the firewall and sodered it onto the green on teh ignition coil. if you give me more information i can definatly help you out

the negative post on the coil

the negative post on the coil

That will work too and was my first thought. On my old cars that's where I hook up a dwell meter/tachometer. Although my CRX manual says that the signal for the stock tach comes right off of the ignitor. I suppose if you were installing an aftermarket tach, it would probably be easier to hook it up to the coil.

I wonder why anyone would need two tachometers in their car?

not every model came with a tach. it was and still is a marketing tool for Honda, the nicer model comes with a tach and the lower ones do not. my car didn't come with a tach but other 83 and earlier models (including the wagon) came with one.
i shold also mention that my dads 2002 5 speed civic didn't come with one either

not every model came with a tach. it was and still is a marketing tool for Honda, the nicer model comes with a tach and the lower ones do not. my car didn't come with a tach but other 83 and earlier models (including the wagon) came with one.
i shold also mention that my dads 2002 5 speed civic didn't come with one either

Every 1G CRX came standard with a tach. The SIs had them simply because they were SIs, DXs had 'em, and HFs had a tach along with a shift light in order to tell the driver when to shift for efficient gas mileage. I'm not trying to put anyone down, I am honestly interested as to why someone would need 2 tachs. I can see that a race car needs to have a tach and shift light within easy eye sight in order for the driver to maintain consistent shifts... but a street car?

well, where is the ignition coil of the crx, because to tell you the truth, i dont where the ignition coil is

a cylinder that the wire in the center of your distributor goes to.