Very slow at work today so I have been surfing around. I found this little gauge that will work as an inexpensive A/F gauge. It is a 9 segment compact 1vdc meter. It runs of of 5-12vdc. Its made by Lascar, its anEM-1710

Look at this article for info.
http://www.autospeed.com/A_0959/page1.html
Look here for the manufacture info.
http://www.lascarelectronics.com/frame_easymount.htm
Call these folks to order.
Allied Electronics Inc
7410 Pebble Drive
Forth Worth TX 76118
Tel: +1 800 433 5700

When I called they had seven in stock.

Enjoy!

 

wow. that's a cool gizmo.
pitty that LCD screen and signal receiver can be produced for less than $2.00

but anyhoo.