On 3/12/2018 5:32 PM, Oren wrote:
On Mon, 12 Mar 2018 17:14:02 GMT, Mary M Piazza
m wrote:

the tank is full & gauge drops down to empty

Measure the level with a stick

Discussed somewhere recently. You can buy a new gauge and probably put
it in yourself. I'd probably get a new one under my HVAC contract with
our oil service provider.