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Hey, i was looking around for an a/f gauge and found a guy that is selling the diagram to build your own from parts at radio shack. Hes selling the plans for like 6 bucks and they are e-mailed straight to you teh same day as you send payment thru paypal. Anyways, what im lookin for is if anyone has these plans already or knows of a website that provides them free of charge? I mean, its jsut basic electrical engineer stuff, it should be out there somewhere for free. If anyone knows where it is, or has it themselves, please post it up or e-mail me teh info. I think this would make an awesome DIY for us here and I would love to see some of the ideas our members come up with for their gauge once its complete....

Heres teh eBay link to what im talking about....

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1871471462&rd=1

 
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I would stick with a company such as Apexi ....they put that stuff through alot of testing so you dont blow your motor...

 
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It's a really simple circuit... Here's one example LINK

Its basically the same circuit as the one on ebay. The ebay one have a 7805 voltage regulator with for example a 0.33µF and a 0.1µF capacitor to supply power to the LM3914. And a cap to filter the signal? (C4) Maybe not necessary. And C3 is if you have longer wires to the LED's

 
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How would you blow your motor by building youw own air fuel ratio gauge? I was thinking of building one myself because of the creativity points it would get.... I mean, you could literally install it anywhere you want, your not limited to a round gauge, or any specific size/spacing of the leds like on a premanufactured one.