I just installed the BK Aero Cruze 100 in my 1974 PA-28-180. I have done some research and followed a thread in here on the settings used to overcome idiosyncrasies for each individual installation. My problems are concerning Altitude hold and tracking. When set to altitude hold there is a constant porpoising plus or minus 200 feet of set altitude. I have considered a static system problem but saw a few posts that had the same problem and were able to negate the severity by using vertical setting adjustments. I just finished my annual and re set the cable tensions to spec. Also the autopilot has a problem turning to a track that is more than 40 degrees from the original track. If you say move from 90 degrees to 180 degrees it will turn about 30 degrees toward the new heading then stop short and seem to hunt and adjust then after a minute or so slowly start moving again to the new setting. I am soliciting help in interpreting the settings and directions i need to go based on other people that have addressed these problems. I plan on calling tech support Monday but wanted to see if there was any knowledge I could tap in this forum.