New Tiara owner... Hello

I am having trouble with the Engine SYNC switch on the dash. When switch is activated, I slowly move the Port throttle forward (as I was told by my mechanic) and it simply increases the RPM of the motor. This just started this year! Last season the Sync switch worked flawlessly. Only difference, I put in an Electronic Control Module that connects to my Garmin Units- would that change anything within the interface?

Located in the Boston area. 
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We just got a 2012 3100 Coronet and would like to get suggestions on the most efficient trim tab settings.

It’s time for wires cap rotor plugs etc I can’t find a set of wires long enough for the 1 longest run.  1993 3100 454’s

The Charles AC master control unit that automatically switches from shore power to generator power on my 2004 52 Sovran Salon has stopped functioning.  All incoming power to this unit is operational., however there is no output except for the 30 A service. I lost generator and 50 amp service to the boat. Charles Industries is out of the marine business and no longer makes this unit. Parts are no longer available., and I cannot find a replacement on-line. Has anyone removed their malfunctioning control unit and replaced it with a simple manual switch to control power to the boat? Please feel free to contact me on my cell at 610-883-3921. Thank you.

Looking for a manufacturer that builds hardtop for 43 open

Good day all, I'm new to the forum and new to Tiera Yatchs. Boating most of my life, last 12 years have been Trawlers. I'm finding a lot of things confusing on this boat. Ill start with one thing at a time.

I fill my 120 gal fresh water tank by the end of the day it's empty. Fwd bildge is pumping clean fresh water out. I can not find the leak or see where it's coming from.

Any and all suggestions would be helpful 
Thanks, BC

Can anyone advise part info for the black cap that’s sits on top of the 3800 Open holding tank, about 5” in diameter, and holds the sensor and water wash down line.i will need a new sensor too if anyone can advise on that. Thanks in advance.

Pending purchase of 1993 Open. Looking for any brochures, owners manuals available. Any help appreciated. Also any owners of this boat now with reviews or concerns.
Thanks
Art