Tattoo transaltion, English to Latin

Cor meum Deo est

Please read this.

Same idea. Getting a tattoo.

"Action is his reward"

I will owe you a beer. Google translate gives me "Actio est pars mercedis illius" but I am told not to trust it.

Google Translate is getting smarter all the time. It keeps a database of
literature in the language requested and uses it to help translate. Pars
mercedis is from the Latin Vulgate version of Ecclesiasticus. It literally
means "the portion of his reward".

Dropping the "portion", we would get Actio est mercedes illius. And, yes
mercedes (reward) is just like the name of the car.