Years ago I bought a broken Sun brand IR exhuast gas analyser at the Flea Market for $40. All it needed was a few transistors and it works again. I don't have the special calibration gas, but I was able to use it to sync up the carbs on my former "Propeller" brand motorcycle. If anyone in the Bay Area wants to borrow it, let me know. Calibration is up to you though, Wolff