I use a mandolin to very thinly slice the cucumbers and usually omit the green peppers but I'll type out the original sweet and sour pickle recipe as is:
7 cups thinly sliced unpeeled cucumbers
1 cup thinly sliced onions
1 cup thinly sliced green peppers
1 1/2 cups sugar
1 cup white vinegar
1 Tablespoon celery seed
1 Tablespoon salt
Combine all ingredients and mix well. Place in a large plastic container, cover and refrigerate for 7 days making sure to mix thoroughly each day.