2007 Supra 22SSV Depth Stuck

[strange_brew]

My depth finder reads fine without the engine running. Soon as I start the engine, it sticks at the same value. Speedometer and perfect pass work fine.

I'm guessing some sort of interference, but haven't been able to isolate.

Any ideas?

[bsharer]

Start with unplugging the harness at the puck and look at the terminals on both sides for corrosion.