I just found in my stash a CHT gage and sender meant for a Corvair ( it says). It is the type that screws on to a #6 cyl head stud. Max temp reading is about 350. Has anybody had experience with this type. I only will use it for a guide, as this is a 140 PG I could put it in. I know the actual head temp must be hotter. MIKE KOVACS