I did a B18A swap into my CRX, and how do I get the speedometer to work? I plugged the cable that rotates into the transmission, do I just have to remove it and try a few times or what?

 

Try jiggling the cable around...it worked for me. or you can also pull your cluster out, drive a block and see if the cable is actually turning. Jiggle it some more if it doesnt, hehe...

*I'm assuming too that you are using a 91 teg speedo cable...I remember I had to change mine when I did my swap. Although I read somewhere that stock ones work too but you have to flip the bracket or something...maybe jiggle it too