How to get heat sink off?

I know this is a bit of a different question

But I have my LRP Sphere TC speedo, and its blue, and it doesnt match my car LOL (going to send the heat sink to anodizing). I ripped apart my fried one, and the heat sink has the glue (IDK what its called) hooking the heat sink to the Fets. I used a heat gun and it came off. But I dont know if that messes up the brains and all of the speedo or not?

Any one have a better/different way to do this? Or am I stupid for trying to do this? lol


Thanks!