Adding on performance mods on your engine will only go so far without a proper Air/Fuel gauge, otherwise you could risk running your engine too lean and blow it up.
The most popular one on the market now is the AEM Wideband UEGO Controller and sells on eBay for around $200-$300. There is also the Inovative Motorspotrs LC-1 Kit with red or blue gauge which is around $289. Well I was searching around today and I found an alternate solution the JAW(Just Another Wideband) reader for $115 assembled with display. The only other major part that you will need to make JAW work is a Bosch Wideband sensor which sells for around $50-$70. Click Here to see a video of the JAW reader in action.
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