Seek the help of a qualified technician if you're still unsure.
To determine which range your pickup might fall under, scope the pickup to see if it is warped.
After 1965, Fender began creating thinner flat work that resulted in warping from temperature change and other variables.
Fender began using the the machine wound process after 1965.
If the wiring is somewhat random and shows different patterns and crisscrossing, it was built before 1965.
If you find your pickup to be near the rating of those listed for 1967, be aware that it could very easily have been built 10 years after the fact, or even later. Use naptha (lighter fluid) or some other fast drying detergent.
Ensure that whatever is used to clean the pickup doesn't leave a residue.
Take the reading from the multimeter that you wrote down earlier and compare it to these specifications (Vintage Guitars Info, 2005).
Year Ohms 1954 5.76k 1955 5.89k 1956 5.98k 1957 6.02k 1958 6.20k 1959 5.95k 1960 6.33k 1961 6.19k 1962 6.22k 1963 6.37k 1964 6.25k 1965 5.80k 1966 5.76k 1967 5.88k This chart, compared with the other variables listed above, should help to narrow down the birth date of your pickup.
Up until 1967, Fender did have several processes that can be measured to determine the date of their pickups.
Even if you've never really used a multimeter, don't be intimidated by it for this project.
The strange and mysterious neck codes found on Fenders from 1969 – 80 have been all but ignored by the vintage and collectible guitar community.