"instructions on which" is a correct and usable phrase in written English.
You can use it to refer to instructions about something specific. For example, "The website gave me clear instructions on which bus to take to get to the airport."
It said that Republican political consultants worked in the "war room" to help shape post-election instructions on which absentee ballots were valid.
During practices, coaches gave instructions on which part of the head to use in making contact and redirecting the ball so that the impact was less painful.
After entering departure and destination points, a user receives information on the journey's distance, how long it should take and instructions on which public transit to take and where to transfer.
For example, there were instructions on which official reports were acceptable for coverage of the notorious "poisonous cowpea incident," in which a pesticide was found in cowpeas that had been grown in Hainan Province and shipped to other parts of China.
Six and a half minutes later, after giving the crew instructions on which landing pattern to use, the controller asked, "Is there any way you can elaborate on the distraction?" "We're just dealing with some company issues here, and that's all I can tell you right now at this time," the pilot responded, with the F.A.A. again indicating that some of the transcript is uncertain.
Instructions on which house to select in specific situations, such as in tower blocks and cul-de-sacs, were given to interviewers.
Women receiving this package leave the clinic with clear instruction on which drugs to take, when to take them, and which ones to give to their babies after birth.
They don't offer clear instruction on which communication channel is appropriate in which situation.
Students could benefit from explicit instruction on which elements seem to be valued by faculty members so that they could construct their proposals with this in mind.
The other has a small L.C.D. instruction screen on which 40 recipes and all the commands appear; it costs about $30 more.
To this end, Ovm components were designed to be parametric with respect to the instruction set on which they operate and its semantics.
