I got tired of my second failing Glowshift fuel pressure gauge and put in an ISSPRO EV-2 that matches my pyro. It's so nice to have a gauge that reads correctly that I can trust. I still have a liquid filled mechanical under the hood for back-up and this ISSPRO agrees with it 100%. Glowshift from new only read 5psi when the mechanical read 18psi  . Did I mention I like ISSPRO?

There is nothing like a good quality gauge. My bro just got some glowshifts for his truck (because of the AWESOME price) and even just holding the bare gauge in your hand, it feels so chinsy!!

I have a Glowshift boost gauge that has been real good to me. The FP gauge..... not so good. I went through 3 senders even with their snubber and a needle valve. Finally got a new gauge with the latest stepper motor technology and it read way off. New gauge but since I was not the original purchaser they would not hear about warranty. Needless to say I'm done with them.

The ISSPRO gauges are so nice! I have the EV series and love them! Glad your enjoying them! Now if I can figure out why my boost gauge makes a weird noise any time it builds boost!

A couple of our venders sell isspro. I have the regular Isspro mechanical fuel pressure gauge and its rock solid. I don't recommend using an isolator. Since I've removed mine I've not skipped a beat!

I have used the isolator without issue. I'm not sure there's much difference between going with or without it, pretty much boils down to preference I'd say!