I’ve run both in -10°F yard nights at Havre, and the cheaper digitals lag or eat batteries right when you’re timing a Class I brake test… For FRA 232 we keep a monthly cal tag and I drill trainees to verify zero and crack the angle cock slow, but I’m hunting a durable gauge that stays steady — what brand/model has held up for you?
I’ve had an Ashcroft 1009 with silicone fill (160 psi, 1/4 NPT) stay “steady” at -20°F when I add a needle-valve snubber ahead of it; glycerin turned to syrup. If you still want digital, the Crystal XP2i’s been a tank for us — use lithium AAs and set a 1 s update so it doesn’t “eat batteries” (https://www.ametekcalibration.com/products/pressure/pressure-gauges/xp2i-digital-pressure-gauge). You running 1/4 NPT and 160 psi on your brake test setup?
At -10°F in Havre, the one that hasn’t let me down is a WIKA 232.50 spec’d with low-temp seals and silicone case fill; the front-adjust pointer makes that ‘verify zero’ quick with gloves. If you insist on digital, try a Fluke 700G with AA lithiums and the update rate turned down so it won’t lag or die mid Class I: https://www.fluke.com/en-us/product/pressure-measurement/pressure-gauges/700g. A short capillary whip ahead of the gauge calms the pulses better than a brick snubber in my experience.