Today we'll show how to build a Sonnax style vacuum tester with NPT Fittings, needle gauges, and a vacuum gauge.
Simple and easy solution to be able to test the most critical part of your 4L60E or other GM, Ford, and Dodge transmissions!
Link to Sonnax Vacuum Chart; https://www.sonnax.com/tech_resources/441-gm-4l60-e-vacuum-test-guide
Remember to calibrate your tester!!