Regulator from a small coleman Barbeque grill is what the guy used in the link that you have obviously already read. They are everywhere and they are cheap. Last one I bought for camping cost me $15.

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Cheers,
Robert

Don't forget that I'm not living in the US thus a "coleman barbeque grill" means nothing to me. After a search (I was using reducer and not regulator as a search word before) I think I found some regulators that might work for me.

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.

Here's another good article on propane fumigation http://www.members.shaw.ca/k2pilot/Propane%20article.html
This fellow is using an acetylene regulator for a torch on his system.

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1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck