I have the ISSPRO EV Fuel Pressure Gauge Kit from Piers that includes an isolator (I know many here prefer to run straight mechanical).

My question is, where on the firewall is a good place to mount the isolator? Seems the driver side of my truck is already quite busy with accessories so real estate is sparce. Would like to see some pics of where you guys are mounting the isolator up as the isolator design doesn't seem too "firewall friendly" to me.

 

I had the same kit, mounted the isolator up under the drip lip that seals the back of the hood, held with a couple of zip ties. It was nice and handy to get to when it quit working, which it did, twice, before I threw it away and plumbed it in solid.