Have a 48 Std Frazer with working Frazer Temp Gauge, but have salvaged (non-original) head. Casting on this head reads "KFO 710280" with date 6-10-48 and has what appears to be a 1/2" to 3/8" pipe thread bushing with electric sending unit in screwed in. With the Frazer temp gauge sending end being a strange thread is the problem. Parts info shows an apparent KF part # 201549. Is this the adapter I need or do I need a different head ? I'm hung up !