Connect with the switch off
Confirm the compressor switch is OFF. Attach its battery clamps to the matching positive and negative terminals of the suitable 12V supply. Start the vehicle engine; VIAIR requires it to run during compressor use. Keep cables clear of moving components.
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Inflate under observation
Attach the twist-on chuck to the tire valve and turn the compressor ON. Remain with it and monitor progress toward the vehicle’s specified tire pressure. Do not exceed the recommended pressure or treat the compressor’s gauge maximum as a tire target.
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Stop to measure accurately
Switch OFF before checking actual pressure: VIAIR says airflow makes the running gauge reading inaccurate. Continue only if more air is needed. When correct, remove the chuck, leave the unit switched off and disconnect power. Let it cool before storage; do not add lubricant to this oil-less compressor.
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Sources / references 1
- VIAIR — 88P manufacturer user manual, hosted by Tractor Supply ↗Reviewed Oct 8, 2026
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