Conversation so far:
what did Chris do after retirement?
After his retirement from F1, Amon dedicated himself to running the family farm in New Zealand's Manawatu District for many years.
did he stop farming at any point?
After retiring from farming, he lived in Taupo in New Zealand's North Island.
what did he do after retiring from farming?
In the early 1980s he became more well known in New Zealand from test-driving vehicles on the TV motoring series Motor Show.
did he do other tv shows?
He also appeared in TV commercials for the company, where much was made of the acclaim he won from Enzo Ferrari.
for which company?
CANNOTANSWER.
what else did he do after retiring?
Amon was involved in the design of the upgraded Taupo Motorsport Park circuit.

Question: What was the circuit for?
Self-contained rewrite: What was the circuit for which Chris Amon was involved in used for?