Temp Fluctuations Fixed Rather Simply, Thanx!!!
Went down the list of recs:
Top hose holding pressure & hot to the touch, got an IR reader, thermostat housing reading 180's F. Replaced thermostat with a 195 degree F, temp gauge still fluctuating like before, t-sta housing still in 180's. Ordered a VDO mechanical temp gauge & in the meantime disconnected wire at sending unit, cleaned mild corrosion off, repeated several times & the gauge finally settled down and kept just an RCH to the left of mid-point. Put a couple hundred miles with no more wild fluctuations. Replaced the original electrical sending unit & holding steady right between 190-200 F. Thanx to y'all for your help. Now its on to the next gremlin (headlight switch broke last nite, already have one on order & checking to see if relay was put in by PO)