They are Metric threads, you need to get an adapter like you use when you put on an aftermarket oil pressure gauge or find a place that sells metric brass fitings......


David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"