looking for source for Sun Blue Line Temp Gauge sending unit
 

looking for a source for a water temp sending unit for my old Sun Blueline water temp gauge---NAPA used to sell them but I cannot find the replacement part number for it---I have the number filed away somewhere but I'm still lloking---some guy in Florida is selling them for like $150-200 which is ridiculous cuz they are only worth $15-20-25 most---anybody got any ideas?? thanx FED387