modifying jgauge for decimal places

Hi folks,

Just starting out with emoncms and loving it so far (used to use Dashing.io for it but it's much more hard work!) but I'm now wanting to do a few tweaks and could do with a pointer.

Self-hosted on Ubuntu, using git tree (83b45830ce6c5ccc53591233e27d843241f63d3e).

I'm wanting to increase the decimal places on the jgauge display, for temperature use. Since temperatures for me are below 30oC they all get rounded to whole numbers. Looking at an old forum post I saw this is done in the render js so modifying:

widget/jgauge_jgauge_render.js

Approximately line 93 I see it changes the decimalPlaces variable depending on the values.
I have therefore forced decimal Places to 1 by setting it after the if else conditions to:
decimalPlaces = 1;

However this doesn't appear to be working, no change to the output shown on the dashboard, so firstly, am I in the right place?
And secondly is this the 'right' way of doing it? (I've forked the dashboard repo so I can track/update using my own repo for future)

Thank you!

Andy