A d3 visualisation that works with Looker customer visualisation API, takes first value of column named "var 1" as current value and "var2" as target value for a Speedo-styled visualisation.
Copy rawgit link of dist/bundle_speedo.js to custom visualisation settings in Looker Admin.
Pull repo, run npm install
to install node modules, make changes and use webpack npm run build
to compile to pure JS.