B727 FLC DEPARTS MHT WITH INOP EQUIP.

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AFTER PUSHBACK; WE STARTED #3 AND #1 ENGS. ON BOTH STARTS WE RECEIVED NO FUEL FLOW INDICATIONS. HOWEVER; THE ENGS CAME TO SPD NORMALLY AND SUBSEQUENT INDICATIONS WERE ALSO NORMAL. WE STARTED #2 AND THE SAME INDICATIONS WERE OBSERVED. WE PULLED AND RESET THE CIRCUIT BREAKERS WITH NO CHANGES. THE CAPT ELECTED TO CALL MAINT. MAINT SAID THAT HE WAS UNABLE TO MEL 2 INOP FUEL FLOW INDICATORS; BUT; SINCE WE HAD PUSHED BACK; HE CONSIDERED US INFLT AND THAT IT WOULD BE AN ENRTE OPEN LOGBOOK ITEM -- WITH THE CAPT'S CONCURRENCE. THE CAPT SAID HE WAS FINE WITH THAT; AND THAT WE WOULD CONTINUE. ON THE WAY OUT TO THE RWY; MYSELF AND THE SO TOLD THE CAPT THAT WE THOUGHT WE STILL BELONGED TO MAINT AND THAT WE WERE NOT CONSIDERED AIRBORNE UNTIL WE RELEASED BRAKES ON THE TKOF ROLL. TWR WAS PUSHING FOR TKOF AND THE CAPT SAID HE FELT SAFE AND WANTED OUR ANSWER. I TOLD THE CAPT THAT I FELT THE ACFT WAS AIRWORTHY AND SAFE; BUT THAT I DIDN'T THINK WE WERE TECHNICALLY ALLOWED TO GO -- I NEEDED TIME TO FIND THAT WRITTEN; BUT IT WAS HIS CALL. HE STATED THAT IT WAS HIS CALL AND THAT WE WERE GOING TO GO. ENRTE WE FOUND WHERE IT WAS WRITTEN THAT OUR TKOF WAS IN QUESTION. WE CONTINUED TO ORD SAFELY AND WITHOUT INCIDENT. ACCORDING TO THE CAPT; HE HAD A DISCUSSION WITH MAINT IN WHICH THEY STATED THAT THEY HAD PROVIDED US WITH BAD INFO; AND THEY HAD CORRECTED THE PROB ON THEIR END.