gauge.js, adjust the vanilla JS code for customizable labels

Hello,
I'm back on clocks, gauges etc. I discovered a JS tool called gauge.js
https://bernii.github.io/gauge.js/

As an excercise I wanted to make an RPM gauge (revolutions per minute).
I can built the gauge with that tool and also ad the ticks with that tool.
Now, adding labels is more complex since gauge.js does not provide a flexible method here.

Since the code is not tool long (of gauge.js) I thought that I can adjust this on my own

staticLabels is an object, that has the following properties: font, labels, color, fractionDigits

gauge.js renders the labels with the code below. How can I approach that method in order to understands how it works in order to make the functionality more flexible?

E.G. Why does the method start with M.prototype.renderStaticLabels??
Thanks a million!

  (M.prototype.renderStaticLabels = function (t, i, e, s) {
      var n, o, a, h, r, l, p, c, u, d;
      for (
        this.ctx.save(),
          this.ctx.translate(i, e),
          l = /\d+\.?\d?/,
          r = (n = t.font || "10px Times").match(l)[0],
          c = n.slice(r.length),
          o = parseFloat(r) * this.displayScale,
          this.ctx.font = o + c,
          this.ctx.fillStyle = t.color || "#000000",
          this.ctx.textBaseline = "bottom",
          this.ctx.textAlign = "center",
          a = 0,
          h = (p = t.labels).length;
        a < h;
        a++
      )
        void 0 !== (d = p[a]).label
          ? (!this.options.limitMin || d >= this.minValue) &&
            (!this.options.limitMax || d <= this.maxValue) &&
            ((r = (n = d.font || t.font).match(l)[0]),
            (c = n.slice(r.length)),
            (o = parseFloat(r) * this.displayScale),
            (this.ctx.font = o + c),
            (u = this.getAngle(d.label) - (3 * Math.PI) / 2),
            this.ctx.rotate(u),
            this.ctx.fillText(
              g(d.label, t.fractionDigits),
              0,
              -s - this.lineWidth / 2
            ),
            this.ctx.rotate(-u))
          : (!this.options.limitMin || d >= this.minValue) &&
            (!this.options.limitMax || d <= this.maxValue) &&
            ((u = this.getAngle(d) - (3 * Math.PI) / 2),
            this.ctx.rotate(u),
            this.ctx.fillText(
              g(d, t.fractionDigits),
              0,
              -s - this.lineWidth / 2
            ),
            this.ctx.rotate(-u));
      return this.ctx.restore();
    }),

Code (JavaScript):