Currently I have a Toro controller which is 17 years old operating my system which has 9 stations-one station is on a drip line. Timer can be set for AM start and operate properly including shuting off-but then starts again in PM using time set for AM start. I am thinking about replacing it with SRC-900i-Hunter SRC plus series. Question--will this work and how difficult is it to install? If not what replacement should I consider?