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After the adverb “when”, when does the next verb is an infinite and when a gerund, and why?

for example:

do I say: He'll tell you when going there, or he'll tell you when to go there? Just for example.

Thank you very much, bye.
Comments  
«He'll tell you when going there, or he'll tell you when to go there? Just for example.»

«He'll tell you when to go there» — He'll say, for example, this: «You should be there at six», "when" refers to what is to be told.

«He'll you explain it to you when going there» — here when denotes the moment of telling.

You can say: "I'll tell you what to do", but "I'll tell you what doing..." is senseless.