The hand is steady the carb might idle up and down 1 or 2 hundred rs the gauge might move from 11 to 12 and back you say start at 10 and move up from there i can go to 28 but it will idle at 1500 with 17 inches one thing strange i dont know if its from moving the dist but when i first started it after puting the gaskets in the tach would drop as fast as it would go up thats the way it use to be after moving the dist it wouldnt drop as fast so today ill set timing at 10 an try again maybe to much timing