insert one dash where needed.\n\well use the town of killarney as our base,\ the irish tour guide said…

Brief Explanations:

To insert the dash, we need to show a pause or interruption in the speech. The phrase "to oh" should have a dash between "to" and "oh" to indicate the tour guide's hesitation or a break in the sentence flow. So the corrected sentence is: "We'll use the town of Killarney as our base," the Irish tour guide said. "Then we'll head out to — oh, how about the Dingle Peninsula?"

Answer:

Insert the dash between "to" and "oh" as: "We'll use the town of Killarney as our base," the Irish tour guide said. "Then we'll head out to — oh, how about the Dingle Peninsula?"