Hi John,

I also had the VM1000 and fuel gage and had to deal with the issues you are now facing.
Support had dwindled to practically nothing and I became convinced that JPI would not stand behind the product.
I finally had to place a call to Jim Irwin at Aircraft Spruce. He made a call to JPI and I got some immediate but partial satisfaction, but I have zero confidence that JPI will provide you with support in the future, period.

NO, you are not able to calibrate in the field.

I  removed all trace of my VM installation and replaced with the MVP-50 from Electronics International.
Their reputation preceded them and their service and support are excellent.

Good luck,

Angier Ames
N4ZQ

Still building