I have a FAST dual channel wideband that records. I've been thinking about building a frequency/voltage converter to be able to record a single channel of wideband and using the other channel to record rpm so that i could play back both on the FAST handheld meter side by side, without the hassle of using a laptop.
Sound practical or more like a good way to screw up the meter?
I don't know if you're wideband is significantly different than the AEM and Innovate units I'm used to seeing, but what you're trying to do sounds pretty difficult. Does the FAST meter have a provision for some kind of aux voltage input? A wideband O2 sensor doesn't have a normal linear output, and the wideband normally has a specialized controller to convert from it's crazy output to a meaningful lambda value. If you don't have a channel that can run a straight ADC I'd consider another logging solution that does have normal voltage ADCs that you can wire you're frequency converter and your wideband into.
What is said FAST dual channel recorder?
BTW, a good frequency to voltage converter is also a tach- the needle is normally just a simple volt meter device.
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