No Go On Reverse Glow

[devanslive]

Okay guys I need your help. I am still on my DIY kick. I got my reverse glow gauge inserts from Stack Racing and was excited. I installed everything exactly how it was supposed to be, with the exception of the ground. I used the screw that goes into the metal part of fuse box as the ground. I started the car and the regular headlights works, the regular gauge cluster lights works, but the reverse glow gauges do not. What am I missing? Please help guys!!!

 

[38stang]

try another ground that one may not be a good source of ground.