Auto parts store or online. Even a book store might have one.
in the manual or haynes repair manual
Owner's manual can be ordered from Ford. You can find a repair manual at most auto parts stores.
According to my Chilton's Auto Repair manual : For a 1987 Ford Taurus : ( 16.0 U.S. gallons or the optional extended range tank which is 18.6 )
According to my Chilton's Auto Repair Manual : For a 1987 Ford Crown Victoria : ( 20.0 U.S. gallons )
Your local public library.
Get a Repair Manual at NAPA, or Auto Zone.
In a repair manual.
Use A Ford Ranger Repair Manual (1983-1992) And It Will Tell You What To Do And Give You Specific Pictures.
NAPA, AutoZone, Wal*Mart, TrakAuto...
Try checking a Haynes repair manual or the like, or get a reprint of the original Ford shop manual.
You can buy a manual repair at any automotive parts store like auto zone ,pepboys,orelley.Ask for a repair manual for Ford Taurus from 1992 to 1995.
You didn't mention what model tractor, but there are many places online that sell manuals for tractors of this age. Search for "tractor repair manual ford 1964" and you will find them.