Oil Tank monitoring?

=== Update, 4 months with an oilpal sensor ===
4 months ago, I got and installed an OilPal sensor, www.oilpal.com, (see my previous post above)

This is a fantastic product it works absolutely flawlessly and does exactly what I wanted/needed.
I can check my tank level in real time from anywhere on the web or via the dedicated Phone app (iOS/Android)
I now know my consumption vs time, how much I consume per day/week/month/year…
I get automated email alert (low level and refill), I can set up (%) the Low Level email alert.

Set up was super easy… just a few minutes and I was good to go.
I did initially put the wrong measurement for my tank (double skinned) but a quick chat with the support and that was sorted in seconds… These guys know there stuff and found the tank parameters in their database just from the name and reference of the tank.

The level measurement accuracy is spot on…
I ran low on fuel, called my fuel company for refill and, while at work, I received an automated “refill alert” email telling me that my tank level was +1000L! I could text the Fuel company to thanks them for the prompt delivery…

It will also send you an Alert in case your tank level change in an usual manner (different to your daily consumption), ie if you have a sever leak or someone is syphoning your tank!

I am confident I won’t run out of fuel ever again!
Re-priming my fuel line and the boiler are now a thing of the past !

Brilliant, affordable product and excellent service!.
Everyone should have one on their tank.