Temp

Hi Everyone, I've a lurker reading lots of your advice and tips. I've finally have a need for your help. I need to replace my pump, so I'm going for a new 2 speed pump to get some rebate savings from my electric company. I currently have a 115v pump and intermatic timer. Do you know if I will need to replace my timer if I upgrade to a 2 speed? I'm considering getting a WhisperFlo 3/4hp full rate 2 speed (115v pump). It has a toggle switch on the pump to change speed. Thanks! OO...how hard would it be to upgrade the time to a 240v? Will i need to pull new electric lines or can I use the current one?