SIP Speedo with cable

Hello everyone, been a while since I've been on here...
Anyway just finishing my GT200 rebuild and thought I would fit a SIP speedo, I was not planning to connect power straight away but just use with standard cable drive for short period, does the Speedo not work at all without power i.e will the cable alone not move the needle?
thanks
Mark
Anyway just finishing my GT200 rebuild and thought I would fit a SIP speedo, I was not planning to connect power straight away but just use with standard cable drive for short period, does the Speedo not work at all without power i.e will the cable alone not move the needle?
thanks
Mark