Racer Parts Wholesale sells them. They also sell K&N.
The four-wire sensors have an internal heater that avoids the time lag and
allows almost immediate accurate read-out.
http://www.racerpartswholesale.com/afratio.htm
I have a dual LED read-out unit that I bought from them some years ago made
by EFI Systems. http://www.efisystems.com/ and mounts under the dash.
I'm going to install two bungs in my new header before I send it off to Jet
Hot for coating.
But a nice Smith Brit analog display is not in the cards.
Jerry
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