If you are using a gas grill heat your grill to between 300 and 350 degrees. If you are using coals, wait until the coals turn grey. Cooking sausages to high will result in a burned outside, and an interior that is not cooked. Cooking the sausages too low will cause your sausage to dry out. Slice the pepper and onion into 1/4 inch thick slices.
Brush pepper and onions with olive oil. Sprinkle onions and pepper with a bit of salt. Place onion and pepper slices on the grill. Place sausages on the grill and cook for approximately 6 to 7 minutes. Turn onion and pepper slices over when they begin to brown. Pepper and onion slices will cook faster on the second side, remove when they have browned to your desired level. Flip sausage over and cook on the other side for another 6 to 7 minutes or until the sausages have finished cooking. When cooking, please ensure that the turkey reaches an internal temperature of 165 degrees Fahrenheit. Assemble sandwiches by slicing the sausages into 1/4 to 1/3 inch thick diagonal pieces. Place 5 or 6 pieces of sausage on each bun and add pepper and onion slices. You may desire to add some mayonnaise or mustard to your sandwich.