FX Impact M3 replacing first reg gauge

Anyone replace their first reg gauge? I have an extra digital gauge that I would like to put on there but the original gauge comes with 2 O-rings and a brass washer. There is no X-ring inside like the other gauge ports. Since there is no X-ring the gauge has to be tightened all the way to seal and that leaves the gauge orientation crooked. Has anyone just used an X-ring instead? Or any ideas how to get the gauge straightened out?