You guys are great my sail number is 903 I didn't know that was the hull number so I think the belt was to loose not a lot of room for adjustment the 40 was to loose. The 39 I had no chance of getting on got a 39 5/8 had to take the bracket off to get it on and the put the bracket back on it's nice and tight and seems to be charging the tack didn't work for the first few minutes it was running but then started working should I replace the tack the hour meter hasn't worked since we got the boat in September there is so much info on here and you guys have been a huge help thank you