AC... I did exactly what you were thinking!!!!I used an Autometer issolater with the 0-30PSI Issopro marine EV white faced fuel pressure gauge. Had to change the fitting on the gauge side was all to connect to the braided steel line... . The only problem was, autometer would not, confirm with me if their issolator would handle the 0-30PSI pressure. I did use this set-up for awhile, however, was lirery about the accuracy and if the issolator would hold the increased pressure. I didn't have any problem with this set-up before I changed to the Dipricol. After installing the Dipricol fuel pressure gauge there was a slight difference in readings... I don't recommend inter-changing any gauge parts from one company to the other.
Steve