Ah, Accumulator, the seasoned voice of reason

Always a pleasure to hear from you, sir.
So my other job just took a $1300 a month hit, so I need to ramp this up more quickly than I had planned. Unfortunately that also means I don't have the luxury of saving up for the dream versions of each item on the list.
So, my parents have an inexpensive pressure washer that they'll lend me. Check that off the list for now. So, my list of what I should get up-front to be able to crank out quality jobs:
- Air Compressor
...... something inexpensive, but capable of an impact wrench for lug nuts, and focused-air blower for getting water out of nooks and crannies, and blowing out stubborn stuff under seats etc. in the interior.
- Paint Thickness Gauge
...... the last thing I need off the bat is an insurance claim. The cheap ones $150-$200, will they work? Any specific recommendation of one around there that isn't just a waste of money?
- Hot Water Extractor
...... okay, this one scares me as far as expense. What am I looking at for the best bang-for-the-buck option? I want to do a great job right away, but if I can save signficant money by forgoing the run-for-80-year quality for now, I'd go that route for cost savings.
- Steamer
...... Is there any point in getting a inexpensive (<$500) steamer? I'm really uncertain on whether this would add much value, or if I should just hold off on the steamer until I can get a 'real' one.
I would love specific recommendations for all of the above! Thank you!