Water temp in Magnum (crate motor version). Where to place probe for gauge? Temp switch for fans?

Quick question to follow up on this- using the part suggested above that extends the thermostat housing, the thermostat interferes with the temp probes (gauge and fan sensor)...is there an optional thermostat design that is shorter in the vertical dimension?

How much damage might I do for driving around with no thermostat in the meantime? It does eventually get up to operating temps.