i just bought a rpm gauge..need help how to install...bought from a classmate so it doesn't come with instruction..need help..
my 240 is a 89 ka24e..

 

im guessing its one of those big ugly ones sthat sit on the side of the window that most ricers have ummmmm =( useless. ne way to answer ur question tap it to the tach wire on the harness easyest is the one coming ou of the ecu

 

kinda like that....