Then why are you even runnin this POS? FIX somethin on the damn thing so you KNOW what you have. This is stupidness. Get a good WORKING temp gauge before you go any further. Do you want to destroy your engine? Is this a complete toy to you? No fan shroud, crappy clutch fan probably wore out, looped heater hose, no thermostat and on and on. Man, you're battin a thousand.
It is incomplete. It has no business even being run. Get gauges fixed.