This is a difficult one. I can't make it out in either language! Does anyone know what it means?

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

Braoin, you can't make this out in either language? Do you mean English? Have you read the earlier posts?

I mean English or Gaeilge. Just that I cannot understand it and so therefore was unable to try a version in Gaeilge. Sorry about that. I would have given it a go as well. But you are getting somewhere and it seems you won't be long in getting a few good folk in agreement with a translation.

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

After some consideration, I think I'll shorten it to simply- Man on fire, born of the sea. What would this look like?

Well, taking what Breandán gave you, and still phrasing it as direct address:

A fhir i dtine bhruite, a rugadh as an bhfarraige: O man on fire, born of the sea

Redwolf

For the shortened version, I'm inclined to follow Redwolf's suggestion of using the nominative (description):

Fear i dtine bhruite, a rugadh as an bhfarraige: "A man on fire, born of the sea"

That is because it was the context of having a following imperative (the order "harness") that originally made me feel the vocative was required. Without the order following, a description seems sufficient. Both would work. Nominative is simpler.

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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).

Thank you all.

You might consider for this strange concept:

Fear ar lasadh, de bhunadh na farraige.

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

Braoin, what is the translation of this?

It means more or less: "A man alight, a native of the sea" (or, "originating in the sea").

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