Matt here's one that doesn't exactly match the truck but the range is perfect for our application. It looks like an aircraft gauge because that's what it came out of. I borrowed this from my RV-4 (kit airplane) since it's been in storage for a while (damn horse hobby, more expensive than airplanes). Gauge range is 0-15 psig and uses a standard Stuart Warner resistive sender. You can get them at Chief Aircraft:
http://www.chiefaircraft.com/airsec/Aircraft/EngineInstruments/ISSPRO.html
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These are made by ISSPRO and are an OEM special for kit planes. You want the one for a carburetor to get the right pressure range. You'll need to get the sender to go with it.
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You'll be into it about $75 plus shipping. You'll still have to get a tee and some fittings to plumb it up. I just tapped into the bleeder valve line.
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Try to do something better looking than I did with an inside out rasin bran box (redneck gauge cluster). Kinda has a wood grain look, huh?
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I've been wanting to talk to ISSPRO here in Portland about OEMing a gauge for us in the 6.5TD comunity. Not sure if they'd be interested in a special that would sell less than a hundred units. I like the case they use on their EGTs and boost gauges. It wouldn't take much to put the meter movement in a different standard case that would match what we use already. It would be cool to have
6.5TD FUEL LIFT PRESSURE on the gauge face. Just need to call and talk with them.
Mike
..got a date in Ellensburg tomorrow...