Oil press sensor thread..?

IIRC, the slant 6 engine used an adaptor when the car was equipped with an oil gauge. The slant 6 light sender threads are huge, so, you had to have an adaptor to neck it down to the standard gauge sender that they used on all the V8 cars. The '72 up trucks (and maybe the earlier ones too, I forget) used a similar one, but, it was a 100 PSI sender whereas the cars had an 80 PSI one.