Well I investigated mine today, and it doesnt look like its adjustable
, which is pants, when you think that the outboard will get installed on all sorts of transom angles. I'll take a photo of it, but its an arm bolted to the engine bracket that locates onto the outboard body as it comes down.. My normal running position is near its base, so the guage is off the bottom of the scale when set for normal running,..
I cant believe its not adjustable ... do you think there could be some sort of calibration on the guage its self ? , cos its just a potentiometer I think