Sorry about that... I wasn't trying to invent a new dialect...fingers got confused with the wandering Ds and Ts!
What I meant to infer was that I would pronounce it TASH-TAH-LEE. That would be a Knock, Conamara pronunciation from seventy years ago.

A clear case of the DTs. There's only one cure.

TASH-TAH-LEE makes sense.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).