I have a 91 crx with a D15B and im trying to hook up a 5 in. tach on the dash, so i hooked up the black, white and red wires correctly, its got power, but i tried to route the green wire into the dizzy and i get nothing as far as a reading on the new tach. im running out of ideas so HELP PLEASE!................ Thanks

 

Try getting the rpm wire as it enters the ecu.

 

or the wire beging the original tach, i think is the blue one

 

Yes, it'll be blue, I forgot there would be a tach in everything since it's a crx,