Wait till he finds some of your fly fishing catalogs laying around.
"Dad I think I need a new "expensive brand name" fly rod. I need a faster action"
"Dad, my fly line is cracked"
"Dad, can I borrow your rod for a trip with my friends?"
What you'd like to hear:
"Dad, I'm going to be tying flies all weekend. Is there anything you need?"
"Dad, I just mowed yards all summer saving for a new rod"
" Dad, I just got a $500 tip from my summer guiding job"
"Dad, you're my favorite fishing buddy"
Have fun with him. some of my fondest memories are fishing with my dad.