I don't mind so much what the trim angle is, more just want to make sure both drives are trimmed about the same amount.
I've actually got a decent fully sealed microswitch which I was thinking about mounting on the drives at some 'max trim' point. Thereby using the trim circuit up to that point and then the trailer circuit beyond for drying out etc. This would at least enable me to ensure both drives are synchronised fully in & at max running trim, to keep them both vaguely aligned. I'm really only concerned about having 1 up a lot further than the other without realising it, thereby hugely straining the steering couplers, or over trimming 1 out and killing a UJ. And boy are the cable indicators expensive, plus my drives don't have the merc standard sensors in them. Other than that, agree with Pete, trim for the conditions.
Originally Posted by Pete7
I think Mat was after a trim indicator rather than the rudder angle indicator. One of the things I have noticed with Hydraulic steering is a certain amount of creep during a long passage, probably due to the torque from the prop going one way. The rudder indicator requires steering to always return to the same position (cable steering) so may not work with hydraulics.
The two types of trim indicator I know of are a cable device and sliding gauge or modify the Merc/Mariner "mercury tilt switch" and use wires to a gauge.
Alternatively just trim the boat until its comfortable and feels right.