Does your's have a plastic line, or metal(aluminuminum or copper)? The plastic lines are prone to break as they age, and any movement of it
can crack it. If it is a metal line, you may have not gotten the fitting tight, or it may have inserted into the gauge crooked, and is not letting the ferrel seat properly.
If you line IS plastic, and it is the original, I'd certainly suggest replacing the line with a new one, preferably with copper, but a new nylon/plastic will work too.
Sorry to hear about the mess under the dash. If it makes ya feel any better, you're not the first one to go thru it, and certainly won't be the last! Get the Simple Green out, and start soakin!!
______________
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"