I just purchased a used boat with a 2004 Johnson 50hp EFI motor. This boat is outfitted with the SystemCheck Commander Tach and Speedometer/Depth Sounder. I am having this problems with these two displays:

TACH
1. Instrument light does not work so at night I can't see the displayed information
2. Fuel flow and trip fuel don't work. Both show '0'

SPEEDO
1. Instrument light does not work

Not having instrument lights is a big concern. The fuel flow and trip fuel isn't to much of an inconvenience. Interesting enough the Fuel Level and Fuel Remaining are working. So, the sender is functioning but what I would assume would be coming from the EFI ECM to calculate fuel flow and total used isn't working.

Any help would be greatly appreciated. Thanks in advance.

Ken