Reasons for a 9K tach to not work?

[CMG]

So my car started out with the orignal gauges, they worked, then when I swapped I used the gauges from the clip, they worked. But I wanted to use the original gauges for the car so I could keep the original mileage, so I swapped in the 9K tach to the original gauges, it doesn't work. Any suggestions on why?

[Hijacker]

make sure you have all your screws on the cluster tightened in and the plugs are tight. The JDM tach will work in the USDM cluster.

[CoupedUp]

The screws act as grounds and power transfer on the laminated electrical sheet.

[CMG]

I'm pretty sure I installed the 9k tach in the cluster correctly, but I will double check today and let ya know. Like I said, I had the cluster from the clip in before ad it worked great, so yeah it must have been me improperly installing it, we'll see.

[CMG]

Well, I figured out what was wrong, it was the tach itself. It just wasn't working, don't know why. I put in the original 9K tach and it works fine now.