Portraying a Financial Burn Rate (dollars spent per time period)

Are there any innovative ways to potray a Burn Rate. Ie how many dollars you are currently spending per time period and your target burn rate and the max burn rate for a certain runway? This might be used to keep track of Software as a Service purchases, cloud services use, or maybe even human capitol for a VC funded organization.

What I am trying to arrive at is a symbol that might be universal with minimal verbiage.

I thought of the following design, and also played around with sort of a gas tank guage idea with three $ signs at the top end and one $ at the bottom. Are there any other ways to display this.

burn rate drawing I am also working on text only portrayals, but my goal is sort of a instantaneous snapshot that would allow one to glance at it and get a sense of the burn rate and any adjustments in say 5 seconds or less. Ie if i am burning 1 gallon of fuel per minute on a boat I can drive for X minutes or something of the sort. (this seems to be a poor analogy)

Also please comment if you have any suggestions for the tags, I am having trouble thinking of proper tags for this question.