Plenty of ways to make your salad dressing...

 

New spray 2.0 - Adjust the pourcentage of oil and vinegar with the adjusting wheel. Spray and you will get required mix. Furthermore, you can use the top pouring feature, move the knob on one side to get oil, and on the other to get vinegar. Easy to use. Technically, so much involved. Maximized space to fit all the mechanism. Here's the evidence.