View Full Version : Oil pressure sender relocation

04-08-2012, 12:24 AM
Having a stupid problem here.

Right now I'm using the st162 pressure sender and watching the pressure in the gauge cluster. I have an aftermarket unit I want to use. Obviously the sending unit for my Prosport gauge is 11ty times larger than the st215/st162's sending unit.

I want to relocate it and have a T-fitting so i can use both the stock sending unit and the aftermarket. I was under the impression the stock sending unit hole is a -4AN size. So I bought a -4AN<>-4AN male/male fitting and a -4AN stainless steel line. While the aftermarket unit threads just fine into the hose and the coupler fits it too, the damn coupler doesn't fit into the head!

So I grab the stock st215/st162 sending unit and sure as shit it doesn't fit into the fucking hose fitting (it's a smaller size than -4AN).

It's not by much, but just a hair. I took the sensors to Ace Hardware and they threaded into a 1/8 fitting just fine (both the aftermarket & the stock unit).

WTF am I missing here?

04-08-2012, 12:32 AM
That the stock sender is 1/8 BSP, not NPT.

04-08-2012, 02:27 AM
So this sender for the Prosport says 1/8" -27NPT for the thread size. Do I need to find a 1/8" BSP elbow fitting to say a -4AN (to connect my hose to), then have T with a 1/8" BSP and 1/8 -27NPT on it?

That sounds damn impossible.

04-08-2012, 02:30 AM
Kind of is. I think the best way is to just get a 1/8 BSP-NPT and go from there.

04-08-2012, 02:32 AM
I can't remember who else has done this but they had it all figured out...

04-08-2012, 02:44 AM
So I'm looking at this.

Fitting, Metric Adapter, Oil Pressure, 1/8 in. NPT Female to 1/8 in. BSPT Male

If I understand that correctly, that will thread into the head on the St215. I can then figure out the connection from there to my line, then a T from the line to both gauges (chances are I'll need another adapter for the stock sending unit). Sound about right?

04-08-2012, 02:49 AM

I need that adapter there (the 1/8" BSPT to 1/8" NPT). 1/8" NPT is the same as -4AN. I can then thread a 90* -4AN fitting into there, extend my line back to where I'm going to secure it, place a T on there and connect the stock and aftermarket sending unit with another of the NPT <> BSPT adapters.

04-08-2012, 02:59 AM
Wait, fuck I'm wrong (again). At least I know I need the 1/8" BSP <> NPT fitting (or something, even to a -4AN would be fine so I could screw my hose onto it). I need a 1/8" NPT dealio for the sending unit I have for the gauge.

I hate math. (not really, I'm just a bit drunk).

04-08-2012, 09:32 PM

*Fuck, I guess they're out of business or something...*

04-12-2012, 06:35 AM
Yeah tunertoys went out a long time ago :( ...I have one of them on one of my cars...

But the latest one I bought was from glowshiftdirect

04-12-2012, 05:18 PM

I know what I was looking for justh having a hard time finding it. I don't like that block thing though, I'm going to tap into where the stock sending unit sits and run a nitrious hose and connect the fittings to the other end of the hose (less stress on the head). Then I can tie it up somewhere too and have it (somewhat) neat looking.

I just don't know where I can hide it at though, I already have a catch can hanging off my strut bar lol.