prosportsgauges.com/ Advertised 5 wire Bosch heated wideband 02 sensor with bung and wire harness. 60MM amber/white gauge (2 3/8) $189 Apretty good deal if you ask me. The ad says that its sensors has the "widest" range. Reads AF ratio from 10:1 to 20:1. Would be good for tuning. Gauge mounts in dash. I guess the "tuner" craze is good for something after all. Affordable AF gauges.
