Aftermarket fuel gauge

I looked up what the 1969 factory service manual had to say for Ohm readings.
Empty Stop= 73 ohms + or - 12.0 ohms
Full Stop= 9.6 ohms + or - 1 ohm. If the ohm meter has a error of more than 1 in 10 ohms a accurate value cannot be obtained.
A 64 manual and a 66 manual more or less said the same thing,just worded different.