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I have the same set up on my 2007 330. The GT 56 is centered between the engines and is driven by a 1243xsv. I also have the original through hull transducer that works as well.

Here’s some background material. As long as nothing bad happens, no one will know, maybe if you sell it could be an issue: https://newboatbuilders.com/pages/33CFR_Fuel.html

12 foot surge here in Inglis! We had 23” of water in our lower level (garage) 330 was secured to float above the lift and it rose 4-5’ but came back down about 6” off ideal placement. Used long scope mooring lines to trees and pilings to accommodate the tidal range.We had 70-80 knots and it had...

Find the installation or users manual on line for your model. That will spell out the process. Otherwise, you are just guessing!

Most VHF-FM Tranceivers are hard wired past the BATT switches as are stereo memory. The electrical schematics will only show GW standard items such as bilge pumps, stereo, carbon monoxide detector, etc. not electronics installed by dealers etc.

Need to know what the brand of engines and gauges at least!

Recommend a stainless steel head versus powder coated aluminum. The mating surface often gets corroded on the aluminum ones. The mating surface is not powder coated on the aluminum ones and it corrodes pretty easily.

Don’t forget that when repowering, the engines may have different lower unit gear ratios so the engine RPM may not correspond to the same prop RPM on a different engine. For instance, the newer 4.2 L Yamaha four strokes have a different gear ratio than the older 3.3 L four strokes.

I am a fan of Garmin. My boat originally came with some old Garmin and upgraded to dual 1243xsv screens. I am a fan of sidescan for where I fish in the Gulf of Mexico. So I have a GT 56 transducer mounted amid ships on the transom. I also have a through hull, don’t remember the number but works...

Scandvik website carries those.

Look for a galvanic isolator which usually has a switch. Typically located under the gunwale near where the receptacle is located.

To see if you actually have one attached pull up your communications menu on your MFD and it will show you if you have one and whether it is communicating with your chart plottler.

Grady does not typically outfit the electronics. That is typically done by the dealer so standardization is not there. Most GPS antennas do not require a clear view to the sky these days. Also most modern MFDs have internal antennas and do not require an external antenna such as the 17xd. Are...

Also consider maintaining your eye’s night vision as much as possible. Prior to getting underway allow for dark adaptation. Keep your interior and MFD lights to the very minimum. . Use no white interior lights and be careful not to allow your spotlight to reflect off the bow. One bright flash in...

You did not tell us the horsepower, year or model number of your motor. Makes it difficult to diagnose. Most larger Yamaha four strokes have a fuel cooler via a waterline like that. Could be that waterline goes to your fuel cooler, but hard to tell given no other information.

Depends a lot on the motors year and model. Modern motors have the hours store to the ECU. If your gauges are digital, that would be a very weird occurrence. What year motors, size, and 6Y5? 6Y8? Analog? what type gauges?

Interesting that you have two pumps for freshwater, so you have a total of three pumps, two for freshwater and one for raw water? There must be two separate freshwater systems then. The key is to make sure you have water to the inlet side of the pump. Determine which side is the inlet and which...

I highly doubt that you have two pumps that provide pressure to your “freshwater” system. My guess is one provides raw water pressure to the washdown system and the other provides your freshwater to the sink laboratory and probably the transom shower station. My 330 has one pump for each raw...