Air Pressure Gauge Discrepency
 

I have two tire gauges, a Longacre Deluxe 52003 (I think that's the model) and an Accugage that is similar. The Accugage reads 4 psi higher than the Longacre. I don't want to use both and split the difference. Which one should I trust?
Thanks!

Find someone else who has one and see which one it agrees with.

I compared my friend's Longacre to my Longacre, and they agreed.

Try a third brand- there could be a bad batch.

Either one if its ever dropped it needs to be checked, air compressor or welding supply shops often do this.

FWIW I used to sell Longacre, very accurate but not very tough for abuse. I started putting mine in a old wool sock for padding in the toolbox, Helps keep the glass clean and scratch free as well.

It is common for different brands and styles of gauges read up to 4 PSI difference. You need to check several against each other and see which ones read the same.

I don't want to spend a lot of money on a fourth gauge to compare mine to. Any suggestions for something cheap but supposedly accurate?

cheap and accurate? LOL

Best way is to pay the 10 bucks to have the calibration checked.
But the actual pressure reading isn't as important as being able to
get to the same reading every time. Once you know where that is at..

A decent priced digital gauge is the most accurate over the long haul, like I said every time you bump or drop a needle style gauge it needs rechecked.

One way is to use a welding regulator with a calibrated output gauge and a small bottle of industrial HP air. Set the output to your expected pressure with the appropriate output fitting and you can at least check the gauges in the shop.

I might take them to Discount Tire and compare them to theirs. The two Longacres (which are both 0-60) are reading 36, and the Accu-Gage (0-100) reads 40. I think the Accu-Gage might be off due to the extended range, and I tend to trust the two Longacres. They are different models, but in agreement. The reason it matters is that I like to inflate my tires to 36 (32 is recommended for the Fit), but I definitely don't want them at 40.

I wouldn't trust any tire shops gauges. they mostly use the pencil gauges and those are +- 4 lbs. its the tire that determines the pressure not the car manufacturer. Thats how ford got in trouble.

3 different vendor tires in the same size and ratings can vary 15 lbs in the optimum pressure.

If Honda says 32, and the max tire pressure is 44, it seems like 36 would be a good pressure.