I bought a book off of Ebay entitled "Gaelige Gan Stró!" by Éamonn Ó Dónaill. It is a beginning level book on Irish. Under the section about saying goodbye, the author has Slán leat, a Éilis. Feicfidh mé amárach tú. listed as meaning Goodbye, Éilis. I will see you tomorrow. Can someone correct me if I am wrong about this, but I thought I had read in other grammar books that the object pronoun form of tú was thú. http://nualeargais.ie/gnag/person.htm also lists thú as the object pronoun. So shouldn't that actually be Feicfidh mé amárach thú.? Ugh.

Expanded to all the pronouns you would get mhé/thú/é/í/inn/ibh/iad

Someone, I think Lughaidh told me once that -inn and maybe -ibh used to exist but not mhé.

I don't think thú is a problem; after all it was very prevalent in Ring, even for the subject (I think) and I think it has a nice sound to it.

I'm sure there are some historical/dialectical differences tho.

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__̴ı̴̴̡̡̡ ̡͌l̡̡̡ ̡͌l̡*̡̡ ̴̡ı̴̴̡ ̡̡͡|̲̲̲͡͡͡ ̲▫̲͡ ̲̲̲͡͡π̲̲͡͡ ̲̲͡▫̲̲͡͡ ̲|̡̡̡ ̡ ̴̡ı̴̡̡ ̡͌l̡̡̡̡.___

The object pronoun is always thú (or contrastive thusa) in Connacht Irish.

Munter appears to use both thú and tú, but I'll leave it to An Lon Dubh and others to explain the details.

I am not sure about Ulster usage. Perhaps Lughaidh can explain the usage in Donegal?

Most CO texts tend to dumb it down to just tú for all cases.

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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).

There's no real reason for one or the other, but thú is far more common as the object form in Munster.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

TYI mentions "tú after consonants, thú after vowels" in a footnote, but has lots of examples with thú after a consonant.

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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).

i know it's possible to say "tchífidh mé tú" and "tchífidh mé thú", but I don't know if there's a rule or something. I'd like to know

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Dónall s'againne (Ó Baoill) in 'An Teanga Bheo - Gaeilge Uladh' just says "Bíonn malartú go minic idir tú/thú agus tusa/thusa nuair is cúspoir na habairte iad". So no rules. 'Course we all know sentences like "Cé a chonaic tú?" can be ambiguous.