I need to check modulator valve pressure and see the value in investing in a pressure guage or gauges for many other uses also. The stuff at the local Advance and Auto Zone doesn't look right to me. What should I be looking for in terms of fitting size and flexibility. Any particular brand,capacity or configuration that should be given consideration? Thanks for any input you can offer.

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Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)