Lead Poisoning

It will stop switching
You cannot use leaded fuel with an 02 sensor ,also avoid using silicone, either will coat the sensor causing it to fail

The leaded fuel I was using was "LL100" av gas. LL stands for "low-lead," supposedly, but I have been to that that is a mis-nomer; that LL100 has a LOT of lead in it!

I am trying to set up the A/F ratio in a boosted application and detonation is my nemesis; it will KILL my engine, especially if it happens under boost.

What do you suggest I do, to get a reading when using 15 pounds of boost; no-lead racing gas? That stuff is like GOLD...

Is that my only option? My engine has an alcohol spray (Snowperformance Boost Cooler) and an air-to-air intercooler of an appropriate size.