Bee Jay,
Do a yahoo search for a miata S2000 starter button. I was looking for resources when this topic came up and there is an article out there about a Miata w/ a S2000 starter button on it. It has instructions on how to install...also an e-mail. Check it out!
http://www.miata.net/garage/pushstart/
Hope this helps...please post info you find on the 914 install when done
Nathan
------------------
'73 2.0 914