What size is the fitting for the oil pressure sender, And where to find the extension hose parts Options

[stugray]

I have seen a few other members who have installed the dual sender unit by using an extension hose from the stock fitting location under the dist.

What parts do I need and where do I find them?
I am ordering the dual sender unit from the bird

And while I am at it, I assume that I will only need a 80 PSI sender & gauge for a 4, right (not the 150 PSI)?

Stu

[Cap'n Krusty]

I have seen a few other members who have installed the dual sender unit by using an extension hose from the stock fitting location under the dist.

What parts do I need and where do I find them?
I am ordering the dual sender unit from the bird

And while I am at it, I assume that I will only need a 80 PSI sender & gauge for a 4, right (not the 150 PSI)?

Stu

1/8" NPT Get the hose from your FLAPS. I use a grease gun hose. Remember, you MUST ground the sending unit! I put a ground wire under the clamp and run it to a bolt on the fan housing. Sender must match the gauge.

The Cap'n

[stugray]

Thanks.

Sender must match the gauge.

I am buying both a sender and a gauge.
So I believe that I will never see greater than 80 PSI on one of these engines?

Stu

[Java2570]

Thanks.

Sender must match the gauge.

I am buying both a sender and a gauge.
So I believe that I will never see greater than 80 PSI on one of these engines?

Stu

Yep, 80 psi is what you need and the Cap'n is spot on as usual with the other details...

[worn]

Thanks.

Sender must match the gauge.

I am buying both a sender and a gauge.
So I believe that I will never see greater than 80 PSI on one of these engines?

Stu

I am trying out a short brass pipe nipple and t arrangement. Has to get through the tin, not get in the way, and be removable. I ended up soldering. Engine goes in tommorow. I am bone tired but will add pics then.

[brant]

the brass pipe is not as good as the grease hose.

the brass can work harden and in theory crack at the base of the thread.

Stu, which pump is on it ?
also are you using the high pressure pistons?

I've used both 80 and 150psi
if a big pump, with high pressure pistons you may need the 150 psi set up.

[stugray]

Stu, which pump is on it ?

stock pump & piston.

I was hoping whatever gauge setup I got it would still work with the better pump when I upgrade.
I ordered the 80 PSI just about an hour ago.

Stu

[brant]

80 psi is good for stock pump.

[Valy]

I'm not a fan of the 1/8 NTP since that's not the correct thread.
I use a brake hose as an extender.

[r3dplanet]

That's interesting. Do you have a photo? Which brake lines? Hard, soft, etc.. How did you mount yours?

I'm not a fan of the 1/8 NTP since that's not the correct thread.
I use a brake hose as an extender.

[r_towle]

Air hose from a paint ball gun also is correct, and looks better.

rich

[stugray]

I'm not a fan of the 1/8 NTP since that's not the correct thread.

If 1/8" NPT is not the correct thread, what is?

I would find it odd for a all metric engine to have a US pipe thread on it intentionally. It is probably one of those cases where the thread is so close that it works fine. Kind of like the seatbelt bolts....
I will just go with the 1/8" MPT.

Thanks

Stu

[gothspeed]

I'm not a fan of the 1/8 NTP since that's not the correct thread.
I use a brake hose as an extender.

+1 ... Yes, the 1/8 NPT is not the correct thread, it is only 'close enough' to capture a few threads and deform the rest.

A 10mm x 1.0 thread pitch will engage threads all the way down and then you can use a copper sealing washer.

[stugray]

Thanks all.

So in other words...."Same as the brake line fitting thread".

However I see that the Hella Pressure switch that was in the engine previously is definitely a tapered thread.
Is there such a thing as a Metric 10mm NPT?

Stu

EDIT: Just found this: https://www.pegasusautoracing.com/productde...ls.asp?RecID=55

Metric Pressure Gauge Adapters, M10x1.0 to 1/8" NPT
Too bad you have to get the $46 kit when you just need the one...

[ThePaintedMan]

Whatever you do, do NOT use brass tubing. I was at the track this weekend when a race-prepped 911 that had a brass "T" cracked that fitting and sprayed oil everywhere. Not only did he risk dropping oil all over the track, but he could have lost that engine over a $2 part. I don't think people realize how fast oil pours out at 40+ psi.

As brant said, they stress harden and crack. We were able to remove the T and simply thread the pressure switch back into it's original hole and had him back on the track in several minutes. The grease hose and grounding wire works great. You can use a closed, or "blind" grommet to cover up the large hole left in the tin.

[Dave_Darling]

The aftermarket sender for the gauge is also kind of large and a bit heavy. If you put that up on top of a pipe, you've got a nice bit of leverage to help wiggle the pipe around and damage the threaded hole or even crack the boss on the case. Not good.

The threads are tapered pipe threads. I'll have to look into the brake hose ends; M10 tapered pipe threads are otherwise difficult to find in the US. 1/8" NPT seems to work pretty well...

BTW, the seat belt threads are in inch size, I think due to some DOT requirements.

--DD

[Harpo]

At the risk of asking a dumb question why not just trim the tin shroud so the larger sender will fit?

David

[Cap'n Krusty]

I'm not a fan of the 1/8 NTP since that's not the correct thread.
I use a brake hose as an extender.

The original oil pressure switch is 1/8" NPT. What makes you think anything else would be correct? The hole in the case is tapered, so threading in a brake hose doesn't assure a good seal, and you'd need a copper gasket on a flanged line. (German brake lines use the taper on the tip to make the seal, NOT the threads. You've introduced a number of BAD things here. Possible (even likely) thread damage to the case, leaks, a gasket to reduce the possibility of leaks, and another junction to deal with farther down the line. For what? The KISS rule applies here ......................

The Cap'n

[Dave_Darling]

At the risk of asking a dumb question why not just trim the tin shroud so the larger sender will fit?

I believe it also interferes with the distributor.

--DD

[bradtho]

I've got a dual pole sender with the hose fitting that came off my car recently. all works great. it's listed in the classifieds if you want to get it all turnkey for cheap.

I was hoping to sell with the gauges but will split if you want it.