Both Cyco and Burty have trim and tab gauges and Burty has an engine height gauge too as he has a powerlift. I want to get a JaySmith trim gauge (pictured) at some point. Nice compact unit should fit nicely below the two lights just infront of the steering wheel. Could do with an engine height gauge too really but havent got the room on my dash so I will probably just set the engine height for the sea conditions and leave it. Too many fekkin buttons and levers in that boat anyways.
Go for mechainical gauges, I have an electric engine trim gauge in Reddevil and its junk. Tells me when the engine is trimmed right up for launching and recovering or down for going along but thats about it.