I'll track down the link again, but I originally found it from a Parker fittings site. I found some another site yesterday (Grainger) that have cheaper valves (air flow solenoid valves for air compressor applications), but they are limited to about 122F max temperatures, even though they run from $42-$65. These lower temperature rated valves could potentially be installed in the cabin of the truck with the tubing lines run in and out of the firewall, which would probably let the tubing cool down adequately and keep the valve in an adequately cool location as opposed to it being under the hood.

Here's another cheapo effort, since we're talking about running the tubing into teh cabin.... simply install a manual valve right through the dash (or some other convenient location near the driver where it would not be obtrusive. Both Parker and Grainger have manual 3-way valves that are less than $20.

I'm going to order my boost gauge very soon, and I'm going to go with the switching valve option - don't know if I'll go fancy with the electrical solenoid valve or go cheap with a manual valve... I'll know in a couple of weeks.

Anyway, I'll lock down the site links this evening after I get home. I'm out on the road again today, so I can't really take the time to hunt them down right now. That parker valve, though, was linked (IIRC) in an earlier thread where I was talking about "Fuel Pressure Gauges" with some other folks - recent... in the past 2 weeks... if you search for my posts you might find the link in one of them.

 

Here's the link for the Parker valve....
http://www.flowfactor.com/Merchant2/...egory_Code=PV3

Here's a link for another site with cheaper valves:
http://www.grainger.com/Grainger/wwg...earchIndexId=2