Idiom: use of "all things X"

Question

While understanding the general meaning of "all things X" ("All Things Electronic", for instance), I'm having some issue putting it into a sentence.

Would you rather use (I can't really explain my issue without examples, but would be happy to edit this based on your suggestions):

• "Please let me know if you have any questions all things electronic"
• "Please let me know if you have any questions on all things electronic"
• "Please let me know if you have any questions on all things electronic related"

Or another way?

I guess my issue comes from not knowing precisely what "all things" implies.

Answer 1

The phrase "all things electronic" functions like a noun. So consider

Do you have a question cats?

Do you have a question on cats?

Do you have a question on cats related?

I'd say the middle one was the best. In the same way I'd use

...questions on all things electronic

You could also say

...questions about all things electronic

... questions related to all things electronic