Scott Marzahl

I'd like to run a -3 AN braided line from the LS engine to the stock oil pressure gauge but I havent had any luck finding a fitting to mate to the GM proprietary gauge fitting. Has anyone figured this out here? If not, I will simply have to run a stock oil pressure line.

Frankie the Fink

Well at least here's a little background on the issue and some suggestions:

https://www.corvetteforum.com/forums...-of-gauge.html

DucatiDon

Mine had a braided line, but I replaced it with the stock line.
IIRC there was a brass fitting on the back of the gauge with an adapter. Ill see if I can find it.

wmf62

https://www.summitracing.com/search/...apter-fittings

https://www.summitracing.com/search/...apter-fittings

Bill

Scott Marzahl

Thank you Bill but I dont think the gauge is a standard NPT size because 1/8" NPT is slightly too big. I tried an Earls 1/8" to -3 AN and no go.

buns

The gauge fitting is 5/16"-24 TPI. I have also been trying to find a way to adapt it to AN-3.

AN-2 has the same size thread and pitch, but I have been unable to source AN-2 fittings. They seem to be made of unobtainium.

Eaton-Weatherhead makes the stock gauge fitting, but I can't find anything else in their catalog that might work.

I actually started to fabricate a fitting on the lathe, will continue tomorrow.

wmf62

what is the size of the AN fitting on the end of the braided hose that has to adapt to the (I presume a compression fitting) on the back of the gauge?

this is going to sound Bubba-ish, but I would get the corresponding brass fittings for the gauge end and the hose end, and with a piece of interconnecting copper tubing and some solder, I would make my own adapter...

Bill

Scott Marzahl

Thank you Buns and Bill. Since the gauge threads are 5/16"-24 TPI, I will center drill a 5/16"-24 bolt on a lathe and then index it to a steel -3 AN fitting and TIG weld them together, that should work.

uvettcha

whats wrong with the way the factory did it????????