| | | quote | Originally posted by 87FieroSport:
What size ... lines ... should I use for [a] mechanical oil gauge?
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Answer: In general, the smaller the better. The line just has to communicate pressure; the flow volume is effectively zero. 1/8 inch tubing would be ideal, but 3/32 is probably the smallest pressure-rated tubing you're going to be able to find, though. Just be sure to bleed air from the line during installation, or the gauge reading will be sluggish.
If you do use metal tubing, put a small (~3 inches in diameter) loop of several turns of tubing between the engine and chassis. The loop will spread out the inevitable flexing in the line and help reduce the likelihood of fatigue cracking. Another option is to use a short section of flexible reinforced hose between the engine and chassis, and then hard tubing from there to the gauge. When bending tubing, use the largest radius you can. Avoid repeated bending, which will work harden the tubing and lead to cracking. If you crimp a tube while bending it, it must be replaced. It's also good practice to install a small orifice at the engine-end fitting, to slow down oil loss in case of a leak or rupture in the line.
[This message has been edited by Marvin McInnis (edited 10-17-2012).]
