Isspro has one out now tooThe only two (standalone) rail pressure gauges on the market (Quad and DiPricol) connect to the factory sensor, so technically it's just "plug and play."
No, isspro has one. ISSPRO Performax - White Face/Red Pointer/Black Bezel.php bottom of the page 3rd to last gaugei think youre mistaken, youre thinking fuel pressure gauge not rail pressure cause if you were right i would totally get the rail pressure isspro gauge.