TAT:"Eternal life in my heart and soul" (CO) ... your assistance is greatly appreciated !!

Beatha mhaireannach nam chridhe agus nam anam
Eternal life in my heart and in my soul

In place of the word agus ("and"), you could also use one of its shorter forms: is or just 's.
In case it sounds/looks better, you could also use na m'anam at the end, in place of nam anam.

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

You posted this in the section for Scottish Gaelic, but you added “(CO)”, meaning An Caighdeán Oifigiúil, which is the official, standardised orthography for Irish Gaelic.

Caoimhín’s reply is in Scottish Gaelic; if you placed the thread here by mistake and wanted a translation in Irish Gaelic, not Scottish Gaelic, let us know.

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Not a native speaker.

Always wait for at least three people to agree on a translation, especially if it’s for something permanent.

My translations are usually GU (Ulster Irish), unless CO (Standard Orthography) is requested.

Kokoshneta, you are astute in your observation as I did in fact post my translation request in error. It was my intention to post the request for translation in Irish Gaelic not Scottish Gaelic as you suspected. Thank you for recognizing and pointing out my error. I will resubmit the request in the correct area. Also , thanks to Caoimhin for your effort in the translation !!