I think I purchased a heater kit from you some years ago and I didn't like the stiifness of the tubing supplied. I went to NAPA and found a more flexible aluminum tubing, a "carburetor pre-heater hose" 1 3/4 x 36 inches. I'm not sure if the ID number is BK825-6005. It looks and works great.
My wife and I have stayed at the Hotel Hershey for the last 12 years.
Its the most pleasant and I guess most expensive hotel in the area.
Go online and see if it is of your interest.
There is complimentary shuttle service to the swap meet fields.
DVV
I own an earlier version of the King tester and also have no manual.
A few years ago I contacted the current King company with no success.
I just emailed the owner of the the posted King tester and asked if he would copy his manual(s) manuals. I'll post a follow-up.