1 for every cylinder would be best, so the average of all 5 is best, where they all meet and mix

i hvae had mine in my down pipe forever with exhaust wrap,
it drop and goes up quickly, around 1k degrees it takes longr to build

i will tap exhaust soon to see the difference in readings

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1985 300D - 599,xxxk - blue interior #265 Monark Nozzle, AL129X, 15" Ronals, Gen II Big Brakes hunting
1985 300D - 491,xxxk - in prog-{A-A IC, 3" exhaust, psi\pyro, 28*BTDC, Hella Euros, IP Limiter removal
1985 300TD - 783,xxxk - parts car,used new engine with ALDA cap inplace
1987 Kenworth T-600 8LL 425 CAT Mech. - 6,000,000+k - DEI exhaust wrap, punched through resonators, 1 recent rebuild,