Does anyone know where to hookup power/ground for the indiglo gauges in a 95 626 LX?

this probably will sound pretty crude but when i hooked up my indiglo's on my 98 626 i took the harness that plugs into the back of the gauges, turned the power on in the car and touched the wire from the new indiglo's on each terminal until they lit up, only after i grounded them to the first available piece of metal behind the gauge cluster. after i found the power supply I just spliced into it. In case you are wondering, the gauges, fuses etc were not harmed during installation and the gauges work perfectly.