ok, thanx, gonna put a clutch on it, im a gauge watcher anyway.When i purchased my 78, i noticed the same thing. The reason that this modification is done, is so that 1, the fan is always spinning at it's fastest speed to increase cooling capabilities, and 2nd, no clutch tightening/loosening maintenance required.
On my vehicle however, the drag is soo much, that it causes the belt to squeal every time the vehicle is revved. Including at startup. To resolve this, i am just going to switch to dual electric fans. You can add a hayden severe duty clutch however. This will reduce the initial drag on the engine. But keep an eye on that temp gauge! Because it might have been swapped to fix a overheat issue.