I saw this thread and got excited... decided to take it on for my dart.. Here are the pics.
I bought the sunpro 2" volt gauge ($20) and tore it to pieces.
I disassembled the cluster and removed the amp gauge.
I dropped the volt gauge internals into the housing to verify fitment in the factory holes(PIC)
I drilled out the rivets on the factory gauge to remove the face (PIC)
I laid the volt gauge face over the amp gauge to outline relief cuts (PIC)
Then I used the screws from the volt gauge to attach the old face (PIC)
The needle was a bit short in comparison, so I cut and glued the factory needle over the top (PIC)
The last few pics are it fully assembled, front and back.
I had previously painted all my needles orange again so the match was good, I think by looking at the old gauge 12v should be just past the thick Middle line, 14v should be just a bit shy of the next line...
I am gonna use some jumpers to hook it up on the battery of my daily to verify...
GOOD LUCK, It took me less than a hour! So do it!
JOE
