in the spritefont properties, you have to set the character size (which for your font should be 7x9)
and you have to tell it what the character set is (which letters appear in your font, and what order they are in), which for your font is:
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
(note the first character before the ! is a space character, so don't forget it or all your letters will be off by one.)