You can do it either way. You can run the SC1000 Mini Gauge and have the digital readings, or you can tap the Brown and Blue wire in the Mercury harness for an analog temp gauge. The wire is already at the dashboard. The SC 1000 Mini Gauge will require a harness from the engine. BCBLast edited by Bass Cat Boats on June 11th, 2009, 4:01 am, edited 1 time in total.