Ann: CAT H1 FY19 Results Presentation, page-10

I cannot say what measures others use to track the value of high growth tech stocks like CAT but one of the measures that I use is share price to "gross profit" where by gross profit, I mean the result of applying the stated margin to the gross revenue. PE is meaningless for these companies that produce negative EPS over extended timeframes. One reason for using this measure (as a kind of proxy for PE) is that most companies reveal their gross revenue and margin in their reports and so it gives a comparative measure across companies.
Using today's guidance for 2019 mid-range revenue of $87M and margin of 75% stated in the report for H1, gives a value 196 for the above measure. That is low compared to XRO at 3181 and PPH at 1037. These companies belong to different sectors but have the same characteristics of high growth and negative EPS in overseas markets. Another interesting small company is IKE which gives a result of 360.
Anyway, having a figure like this indicates the level of value in CAT at present along withe the expected growth in revenue of 17-20% for the year.