Is this where I drill the water pump housing for gauge sensor? (Pics!)
 

I did search!... lots of threads have missing photos... or people say "just drill your WP housing!" ....thats great... but WHERE do I drill?!

I bought a spare WP housing so I can pre-drill, ?powdercoat?, then just install right after.
I found one lone photo pointing at a possible area, but I want to make sure. The photo is so horrible I cant even tell WHERE I'm looking on the WP.

Here are pics of my spare WP housing. Can someone tell me the BEST, or, PROPER place to drill for a gauge sensor?

(Im all about an obsessive compulsive manner.)

In the photo:
LOCATION 1: is a stock sensor tap that I need... Already lost the sensor it came with, I'll just use mine.
LOCATION 2: this blank plateau... I believe this is where you want to tap for a sensor... correct? Will anything hit the sensor? IE: I can only tap so far down?
LOCATION 3: Your opinion?

https://www.rx7club.com/attachment.p...1&d=1358394193

https://www.rx7club.com/attachment.p...1&d=1358394193


...now I just need to find a drill tap for 1/8bspt... stoopid Defi gauges and their Japanese thread pitches....

Yay..s5 Wp Housing.
YES that is fine,nothing will hit in there.
At least with an S4 you can use the Thermo neck sensor location.(or make one,there is a spot on the neck.).

You could always run an inline adapter that goes in between hose ends.

http://www.jscspeed.com/images/produ...d89fd0d543.jpg

Probably under $20 shipped from ebay.

Those are find for using a thermo switch to activate an e-fan, but if the thermostat were to stick closed I wouldn't want my temperature gauge sending unit to not be in a position where it wouldn't reflect that. If the t-stat sticks for an efan switch it doesn't really matter as the e-fan will be of no use anyway.

Oh I thought this was just for a gauge haha. Disregard my other post sir

really? that sounds really easy. oh well, I've been stubborn and wanted to do it only this way for a long time. I'll remember that though, thanks!

Thank you for your input, such a simple question, but makes me feel better. just wanted to hear from someone who knows stuff, so thanks again.

hah.
You know, I had a "disclaimer" to people about not mentioning this idea, or any idea that was anything but directly into the WP housing, nothing else :D
At the last second I just deleted it.

bingo. exactly why I just want to go ahead and do it the right way the first time. This is the end-all-be-all reason for installing a temp gauge. If I'm gonna take any time to install "safety" equipment, I'm simply going to go all the way.

Why hasn't the stock location been mentioned?
Seems to me the "rightest of the right ways" would be to put it exactly where Mazda did.

There is also a perfectly fine location at the bottom of the front iron, already tapped and plugged, just awaiting a sensor.

well two problems:

1: all the fittings on our cars, and in our general lives, use 1/8PT. The sensor I have uses 1/8BSPT. its JUSTTTTTT so different, that your more than likely gonna strip the threads if you try to retap them for BSPT.

2: I dont wanna pull out sensors and have a janky looking, non working gauge cluster. Trying to keep as close to a OEM "proper"/"No electrical tape, only solder and shrink wrap" kind of modifications.

3: I did not know about the front iron spot, I would like to know where it is... but Im afraid that falls back to problem #1.

The oil pressure sensor thread is 1/8 BSPT on our cars... :)

Really?! I did not know this at all. Well now I know that. I up picked up a greddy oil filter sandwich that goes between the oil filter and the filter neck. It has two 1/8BSPT fittings, so oil pressure/temp are not an issue. Its the water temp that is giving me more trouble.

Im kind of curious why a japanese car has NPT fittings... I would think it would have BSPT all over... So in japan do they deal with NPT fittings as well? Would they go through all that trouble to make two different cars completely? I never NEVER considered thread pitches until now.

I have a S5 turbo so mine had a port on the back of the housing already drilled. IIRC that sensor is for an electric fan on the a/c condensor. My car does not have that fan so it was an unused sensor in the port. I put a Starion temp switch in that factory spot for my electric fan.

I had the front of my housing drilled where the air pump bracket mounts. You have to be careful with that spot though. On the rear is the OEM thermosensor. If your aftermarket sender or switch is too long you can have fitment issues.

http://sphotos-b.xx.fbcdn.net/hphoto..._3706208_n.jpg

http://sphotos-a.xx.fbcdn.net/hphoto..._6003974_n.jpg

I had no idea about the back of the WP housing... I had no idea the AC had an electric fan, WTF mazda, why did you make the rad fan clutch type... I wonder if my WP housing is a turbo housing... Im gonna have to look when I get home.

Your post just opened up a can of worms for me though... Since I did not know about the back spot, I want to take your idea for installing a sensor for when I do an electric fan, or should I just try to install my gauge back there... but now I gotta be careful no sensors hit each other... Im guessing any pre-tapped holes on the WP housing are ONLY going to be 1/8 NPT? This 1/8 BSPT sensor is what makes all the trouble...


Thanks again everyone for your input.

automatic transmission cars also had a second temp sensor there.

Why put in an inline adapter and have a couple more failure points? Just do it the right way and tap the WP housing. People have shared a couple good spots.

Ok... Now im back to square one... literally... so annoyed, I almost want to just dump the car off at some fucking performance shop.....

I went back to Defi's website and this was taken DIRECTLY from their website:

*Defi sensors’ thread size is all 1/8PT.*

So now Im dealing with like... 6 different thread taps????!!! PT, NPT, BSPT.... what the fuck... I *THINK* PT, and BSPT are the same... Is this true? I have yet to fit the sensor into my greddy oil filter adapter... the adapter is supposed to be PT, which they say is the same as BSPT... And if I look closely, it looks like the sensor threads taper INWARD... unlike normal threads that dont taper.





Also... Defi's website states that you need 30mm of space for the water temp sensor... well shit, will this fit inside the water pump housing?

I looked over my post and found an error. The sensor/sender/switch my aftermarket temp gauge sender almost came in contact with is the OEM A/C fan switch. If you look at the pic again there is a sender above that is out of focus and blurry. THAT one is the OEM thermoswitch. The OEM one below is the one I swapped out to use as my efan switch. I've got the engine apart for a rebuild so I'll get some updated pics for you next time I'm working on the engine.

Using both front and back of the housing where I did does limit the size of senders and switches I can use. I'm currently using Prosport temp and pressure gauges. Prosport temp gauges are very short, other gauge senders aren't so short. I'll eventually be swapping those out for AEM gauges all around. (For the record I bought an AEM analog boost gauge and simply love it). AEM temp sender is long and I won't be able to use the same spot because the two senders (temp switch and temp sender) won't fit.