Autometer air fuel meter/gauge.
Comes in white, silver or black faced, your choice. Connects to your O2 sensor wires. Monitors how rich or lean your engine may be running. If you have a bad 02 sensor, it may help detect that too. HEY, it looks cool at nite too with its digital readout!
Also now available in El-glow and Cobalt Blue !!
(email for details)
More info here: