Looked around, but couldn't find a confirmed thread type for this. I am installing a SPA combination gauge for boost and temperature, which comes with a brass thermowell/sensor/sender that has 1/8NPT threads. I want to know, for sure, the thread type of the tap on the rear iron for this, next to the oil pressure sensor/sender before I go unscrewing anything. Especially this.

 

Most people use a brass T-fitting in the TB coolant hose, or a radiator hose sender joint, or tap near the thermostat housing to monitor coolant temp. Are those not good options for you? I can't recall, but I think the ecu is taking temp at the rear housing. So, wasn't sure if you'd lose something by switching to the gauge.

Sorry, don't know the thread for that port off-hand. I'm sure someone else will.

 

From what I have been told, the stock gauge sender location is the best option. I have drastically simplified many things on my car, and I am not running a water line to the TB. Mine will be a track day car, so I wanted to keep a close eye on temps. This is the reason for the SPA gauge - I wanted the warning light flasher, and not many make that. Also, I understand that running a sensor/sender ahead of the thermostat is not always for everyone, as you don't get accurate readings until the thermostat opens. If that works for the track junkies around here, I would consider.

 

I'd look elsewhere to install, one thing not to do, is install the brass T at the engine, to run both sensors. At the end of a hose or on the radiator hose as suggested is a lot safer, as the brass usually cracks in the tread with vibration = no coolant. If you want to persist, NPT is pretty much a US only thing, you can kludge a 27tpi thread into a 28tpi hole with teflon......wouldn't recommend it, for anything critical. Vaguely recall this is BSPP not BSPT too, but long time since I've pulled one out - should be easy enough to check with verniers.

 

So can you confirm that it is, in fact, a BSP? Parallel makes sense, if so. Thanks!

 

Finally remembered to look at a dead plate today, it's actually taper - and yes British pipe.

 

thank you!!!!!!