I have a related question.

The gauge has hash marks numbered 40, 80, and 120. I'm assuming the un-numbered hash mark between 40 and 80 is 60 and the one between 80 and 120 is 100. Is that correct? They appear to be pretty linear and evenly spaced, but I thought I saw where someone said in another thread that the hash mark between 80 and 120 was 90*C...

I ask because I just swapped my t-stat and now instead of reading somewhere between 80 and the hash mark below it (which I assumed to be 60) it now sits between 80 and the hash mark ABOVE it (which seems like it should be 100).

since 100*C = 212*F somewhere right around 100 seems like it should be optimal for engine efficiency - right?

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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown