I finally installed my Indiglo's this weekend. Between Cheston's instructions and the tip that "CKNY "provided (using hot glue to hold the gauges down) the install went fine and the gauges look and work great.

"CKNY" (Chris???) suggests using hot glue to hold down the gauges instead of double-sided tape. I actually put double-sided tape near the center of the gauges and then used little dabs of hot glue on the outside of the gauges (where the gauges are just plain plastic - not the actual indiglo part). I also used hot glue between the original guage face and the plastic part of the gauge cluster below it to help keep the entire setup from falling forward.

Even my fiancee (who could give a crap about cars) liked the way they look, and my 34 year old sister wants me to put some on her car (don't know if they exist for 7-year old subaru wagons though).

Thanks to both Cheston and Chris.