shift light wont work please help!!!

[B16Civic93]

i have a shift light that i installed in my civic its a 93 ex and i used a rpm activated switch to activate when it works, i wired it exactly how the directions say, i wired it to the back of my gauge cluster for the tach reading and the tach stopped working and as soon as i disconnected teh wire the tach worked again, i was wondering if there is somewhere i can wire it to? does anyone have any experience with this that they can tell me how to wire it? any help is appreciated, thanks in advanced

[boosted k20]

your supposed to connect the signal wire to the negative side of the ignition coil (which is inside the distributor). i think that u dont have to go inside the distributor to get to this wire. im not 100% sure, but i think it's one of the blue wire next to the distributor.

[murata2k]

Boosted, your right about the distributor. Just remove the cover and look on the ignition coil. It's marked with poitive and negative where the wires are screwed down.