Watergate Cake

1 box white cake mix
1 box pistachio pudding
1 cup oil
3 eggs
1 cup ginger ale
1/2 cup chopped nuts

ICING:
1 1/2 cups milk
3 envelopes dream whip mix
1 box pistachio pudding mix

For cake, mix all together and bake in a 9x13 inch pan at 350�F for 40 minutes. For frosting, put milk and dream whip into bowl. Gradually add dry pudding to this and beat until stiff. Spread on cooled cake.