Lemon Meringue with pudding

1 (18 1/4 ounce) package lemon cake mix 1 1/3 cups water (or as called for in cake mix directions) 1/2 cup vegetable oil (or as called for in cake directions)[...]

1 (18 ounce) package lemon cake mix 2 eggs , adjust per box directions 1/4 cup oil, adjust per box directions 1 You will also need ingredients called for in[...]

1 (18 ounce) box lemon cake mix 1 (8 ounce) container Cool Whip 1 egg white, plus 1 cup egg white 2 cups milk 2 (3 1/2 ounce) packages instant lemon pudding[...]

1/4 cup sugar 3 tablespoons cornstarch 3 tablespoons flour 1 dash salt 1/2 cup hot water 3 egg yolks, slightly beaten 1/2 teaspoon grated lemon peel 1/3 cup[...]