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The real answer is that it should not have been based on the wearer's manifester level and key ability modifier. Reason being that anyone can have a psionic tattoo, not just a manifester, so there won't always even be a ML.
That said, if you had to pick an ability score I would go with Wisdom since that's what the Gifted Blade archetype uses.
I would just overrule the whole bit about using the wearer's manifester capabilities and instead use the tattoos ML + the minimum score needed to manifest the power it's using. At best I'd let it be a case of use-the-higher, much like staves, but since the nearest standard item analog to tattoos is potions I'd probably leave it using the item's stats every time.