I’m installing the AFR sensor below on my ‘82SC. I had an O2 bung welded to the driver’s side header. I don’t see much benefit on a CIS car to having dual sensors. I already have a big oil pressure light in the clock space and didn’t want another gauge. The one below syncs up to your phone. I’ll use it mainly for tuning.
https://pe-ltd.com/product/wideband/
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