Review on Equus 8366 Ratio Gauge Aluminum by Marcus Barlow

I installed a broadband lambda sensor in each exhaust pipe near the cylinder head outlet of an air-cooled boxer flat-twin motorcycle and combined it with this Equus 8366 Air/Fuel Ratio Gauge, I can get Keihin 32mm CVK carburetor jets. Much easier than trying to read hot spark plugs on the side of the road. In addition, the results are repeatable regardless of the quality or lack thereof in the fuel. The first one I ordered had a problem, it didn't work at all (the lights didn't come on). Revain emailed them a free postage receipt which I just had to put on top of the package and give to my postman. They sent a replacement the same day. The new one they sent works great, this is the first edition with all the items I've ordered from Revain and they fit great. Very simple connection, one wire from the left O2 sensor, one wire from the right. O2 sensor, 12 VDC, hot and grounded, switched source.