Compare your gauge with another gauge, possibly a digital gauge. go to your local auto parts store and ask to use one of theirs, they might not let you use a digital but you never know, it’s worth trying if it means that much to you.
Compare your gauge with another gauge, possibly a digital gauge. go to your local auto parts store and ask to use one of theirs, they might not let you use a digital but you never know, it’s worth trying if it means that much to you.