The wire ones for used spark plugs, new ones and most other task flat ones work quite well.
No problem stacking the feelers, just try to use as few as possible, check with a micrometer if you're curious how well it works.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-