No display on speed, fuel,trip,time & battery digital gauge

[wjedwards61]

This gauge is hooked up to a set of twin 2001 150's HDPI's. The screen went blank between outings. The gauge has a harness with a pair of black ground wires, a yellow, red , white & blue wire & the speed tubing .There is constant power to the red & yellow wire with the switch on & the blue wire is the gauge light. The white wire is connected to a pink wire which is fed through a six wire plug through the hull to the rear engine compartment & no signal is coming thru it at all. Can this gauge be activated to check the lcd function & can it be checked off of the boat ? Help! Thanks Bill

[boats.net]

If you have 12 volts to yellow and red wires(at gauge) and a good ground the gauge should power up.