ive read through some posts on adjusting the trim sensor on the lower unit but im not sure this is my problem. if i trim the unit all the way down the needle reads correctly but if i trim it up it stays in the same spot showing its still trimmed down,as soon as i hit the trailer button it works and will max out the needle on the gauge when the unit is at the highest trailer setting.can this be adjusted with the sensor at the pivot or do i have something else to look at..im kinda new to i/o so bare with me thanks.