How to test changes in tanstack forked repo locally

Guys, whats the best way to test changes in tanstack repositories locally in yours projects?

I mean:

I have a project A started with tanstack-start
I forked and 'v done some changes in @tanstack-router repo [router/packages/react-router]
In my project A I want to use mine local tanstack-router instead of this installed with tanstack-start

I tried with pnpm link bit in vein, got some errors.