Bring a large pot of salted water to a boil. Cook elbow noodles according to package directions. Drain and rinse with cold water until pasta is cooled. Drain well.
In a large mixing bowl, toss together cooked noodles with tuna, eggs, onion, celery, and peas.
In a small mixing bowl, whisk together mayonnaise, cider vinegar, dill, sugar, relish, dijon mustard, salt, and pepper.
Pour sauce over pasta and toss until everything is well coated. Cover bowl with plastic wrap and chill at least 1 hour before serving.