I tried that when I had my '92. The problem is some of the early cars don't have all the necessary wiring on the factory harness. Mine fell short where the main cruise power switch plugged in. If you do a search on miata.net, you will find several threads concerning that.
I ended up installing the Audiovox CCS-100 on my '92. Worked great!



					
						
 thanks from wills point
						
					
					
					
						
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 Let's go racin'