Hi,
I've tried all the versions of this program and them not working fine for me, but i loved the idea and the simple layout of this program so i've tried to make the program working good for me.
It took me 2 days of trying and testing and now the program does finally what i wanted.
The first thing i did was to make the program proof for crashing on empty tanks, so i made a check if tank["contents"] is nil or not. If it's nil then the tank is empty and conaints no fluid.
Also i fixed the tank conains nil issue, it now displays the amount in the tank.
And i made some changes in the text output and removed a term.clearline() cause it was doeing that on the advanced monitor and not on the computer's own screen.
This works for me on minecraft 1.7.10, computercraft 1.75, open Peripherals 1.3, Railcraft 9.12.2.0
Here is my version of tankmon
http://pastebin.com/p5XEWFw4
In CC's advanced computer (tank and server) do
pastebin get p5XEWFw4 tankmon
and run it, first run the server and then the client(s)