INCORRECT FUEL SLIP; INDICATED HIGHER THAN ACTUAL.

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AS A CREW; WE 'CAUGHT' THIS FUELING ERROR; BEFORE TKOF; BECAUSE WE FOLLOWED THE CHKLIST CLOSELY; THINKING CLRLY ABOUT VERIFYING EACH ITEM. WHEN THE PMS TKOF WT DISPLAYED; WAS 2000 POUNDS LESS THAN WHAT OUR COMPANY WT AND BAL INDICATED; WE INVESTIGATED TO FIND THE DISCREPANCY. THE FUELER HAD INDICATED A RELEASE FUEL LOAD OF 17000 POUNDS OF FUEL ON THE FUEL SLIP WHICH WAS DELIVERED TO US; IN THE COCKPIT. THE FUEL GAUGES ON THIS PARTICULAR MLG; WERE NOT THE DIGITAL TYPE; BUT WERE THE 'TICK-MARK' VARIETY WITH ONLY 1 NUMBER; '5' AT THE 5000 POUND MARK. AS WE COMPLETED OUR PRESTART CHKLIST; WE VERIFIED THE FUEL SLIP; WITH THE RELEASE; WITH THE FUEL GAUGES. BUT TAXIING OUT; WHILE PERFORMING OUR TKOF CHKLIST; WE DISCOVERED THAT EACH WING FUEL TANK WAS EXACTLY 1000 POUNDS OF FUEL LESS THAN THE FUEL SLIP INDICATED. WE PULLED INTO THE RUNUP AREA; CALLED DISPATCH; AND RECEIVED AN AMENDED RELEASE FOR 15000 POUNDS OF FUEL; WITH AN AMENDED ALTERNATE AND HOLDING FUEL. WE WERE NOW READY; AND 'LEGAL' FOR TKOF. THE FUELER OBVIOUSLY MADE A MISTAKE; BUT DID THE PARTICULAR TYPE OF FUEL GAUGES CONTRIBUTE TO HIS ERROR; AND OUR ERROR IN MISREADING THEM BEFORE ENG START? I THINK SO! ANYWAY; FOLLOWING STANDARDIZED 'COMPANY' CHKLISTS ENABLED US TO 'CATCH' THIS ONE AND CORRECT IT BEFORE TKOF.