I've tried a bunch of inflators including a much more expensive Milton inflator but I've found this cheap one below to work great. Not sure how long the gauge will stay accurate but so far so good.
https://www.amazon.com/Oasser-inflator-Pressure-Compressor-Accessories/dp/B07H34M6XX/ref=sr_1_3?keywords=Oasser+Tire+Inflator&qid=1553622015&s=gateway&sr=8-3PS: I've left the inside flow through caps but on the 2 outside and the front I removed them and just use a standard cap. Gives a bit more room to get to the inners. YMMV
