Civic EG

i just got a used automatic gauge cluster that has a tach and i hooked it up to my 94 dx coupe now it lights up and everything works but the tach doesn't rev. there's a open socket for a plug in the back of the cluster but theres nomore plugs behind the cluster on the harness to plug into it... My stock dx cluster doesnt even have the white box that the open socket is connected to, but my 93 hatch has a green plug on the harness behind the cluster is that what i need in my dx? should i try n splice and match wires, or is there something else i can do like wire it to the distributor? or is it a bad fuse or something?? please give me some help. I'm confused and cant find any info..

It should just be plug and play, even if its an automatic. Maybe the Cluster is bad?

ill test it on my buddies car hopefully ill realize i forgot to plug something in. but i doubt it. THanks!

the cluster worked in my buddies car but still isnt in mine everything else seems to be working tho except the rpm gauge