Well, I wasn't trying to 'correct" anyone.
I just found the info on my Ford Service DVD, as my '97 does the same thing.
No, I haven't changed the pump yet.
My question is, when one goes down to the local parts house and gets a rebuilt water pump is it the revised version or, as I assume, just a recycled old version.
I would think that if someone were having the wavy gauge problem and just went and got a rebuilt pump, the problem would still be there.
Of course, the 'genuine ford' part is probally rather costly, but if it stops the gauge from bouncing around it would be worth it.
Just for info, I had a 3.0 that started the wiggly gauge deal AFTER I changed the thermostat.
And I bought one of those 'premium priced' thermostats for my 4.0 and it didn't change a thing.