oillicker Posted March 25 Report Share Posted March 25 I'm adding a mechanical oil pressure gauge to my '72 521 because I don't like the idiot light. Its a Bosch mechanical oil pressure gauge kit and I believe the pipe fitting going into the block is 1/8 inch? It will screw in about a single thread then any further feels close to stripping. I was thinking the engine is metric or bsp and this gauge kit came with standard threaded fittings. Quote Link to comment
Crashtd420 Posted March 25 Report Share Posted March 25 (edited) It's a 1/8 bspt.... Edited March 26 by Crashtd420 Quote Link to comment
Crashtd420 Posted March 25 Report Share Posted March 25 (edited) You can actual tap it for 1/8 npt which is what most after market gauges are.... Just get a 1/8 npt tap... Put grease on it to catch the chips and go slow... back it out often and clean off the chips... use the oil gauge or sender as a gauge to how much to thread.... Edited March 26 by Crashtd420 2 Quote Link to comment
Crashtd420 Posted March 25 Report Share Posted March 25 (edited) Or the obvious get a 1/8 bspt to 1/8 npt adapter... Edited March 26 by Crashtd420 1 Quote Link to comment
banzai510(hainz) Posted March 25 Report Share Posted March 25 think this will work https://www.ebay.com/itm/293613922481?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A18dorl2eNQF2yGXZJanvW4w20&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=293613922481&targetid=4580153139789012&device=c&mktype=&googleloc=&poi=&campaignid=437225722&mkgroupid=1224856224320848&rlsatarget=pla-4580153139789012&abcId=9300906&merchantid=51291&msclkid=d4ace2ed9fed119f46ef84ec6dd7a13c 3 Quote Link to comment
oillicker Posted March 25 Author Report Share Posted March 25 That was quick. Thanks Crash and Hainz. Im gonna try that adapter and if it doesn't work Ill tap it. I know its been explained a thousand times before but I'm still figuring out posting pictures. my truck Quote Link to comment
Crashtd420 Posted March 25 Report Share Posted March 25 You should see add files in the box your typing in.... 3 Quote Link to comment
mainer311 Posted March 25 Report Share Posted March 25 (edited) It’s 1/8 bspt, not 1/4. Buy this. Put original sender in end, and new sender on the side port. Then you get both an idiot light, and a gauge reading. https://a.co/d/5y35LRZ Edited March 25 by mainer311 2 3 Quote Link to comment
datzenmike Posted March 25 Report Share Posted March 25 Finally!!! British Standard Pipe Taper. From the early days of Nissan on the North American continent in the mid '50s. Nissan paired with Austin of Great Britain making British cars and copied everything including the oil pressure pipe threads. Somehow that remained through till the '00s at least and maybe they are still used today. Quote Link to comment
mainer311 Posted March 25 Report Share Posted March 25 Yeah, total pain in the ass! Quote Link to comment
Crashtd420 Posted March 26 Report Share Posted March 26 (edited) 2 hours ago, mainer311 said: It’s 1/8 bspt, not 1/4. Buy this. Put original sender in end, and new sender on the side port. Then you get both an idiot light, and a gauge reading. https://a.co/d/5y35LRZ Thanks... fixed my idiot light.... don't know what I was thinking... he clearly said 1/8.... I knew 1/8 and typed 1/4... multiple times..... sorry oillicker been a long day.... Edited March 26 by Crashtd420 1 Quote Link to comment
banzai510(hainz) Posted March 26 Report Share Posted March 26 yeah my bad, what was i thinking Love that color 521. If you motor is not a oil burner I would not worry about it. As most people have the cheap ass oil lines then they crack and youll be stranede with a bad motor when the oil line cracks. Buy a good braided line. or a t least a Autometer oil line a good future investment would be a hi output oil pump instead of the mechancal oil pump gauge and line. In my opinion.(but youll have to time motor then drop the pump. install correctly) if not a motor guy then dont do it If you have a oil burner a mech gauge is cool so you can see when you go around a corner the pressure will drop and you know your low on oil. Quote Link to comment
Slow Loris Posted March 26 Report Share Posted March 26 First time I fired up my 521 I was treated to a laser beam of oil shooting out of the cracked plastic line all over my driveway. Of course I replaced it with the same type of line but…that’s because the sender I got from autozone was the wrong thread. Maybe you’ve got me rethinking it. Quote Link to comment
banzai510(hainz) Posted March 27 Report Share Posted March 27 (edited) I had the adapter then to 90deg elbow. On my 510 I went back to stock sender Edited March 27 by banzai510(hainz) Quote Link to comment
Stoffregen Motorsports Posted March 27 Report Share Posted March 27 Be sure to remember the "T" at the end of BSP. They are different threads, BSP and BSPT. 1 Quote Link to comment
datzenmike Posted March 28 Report Share Posted March 28 The T is for taper These threads actually form a leak free seal by tightening unlike a nut on a Bolt. 3 Quote Link to comment
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