I just got info that the SPA sending units are 1/8" BSP (British Standard Pipe) thread, which is 28 threads per inch. The American pipe thread is 1/8"-27, or 27 threads per inch.

Anyone run into problems? Leaks, or poor engagement depth?

As I understand, the US sold gauges are 1/8" NPT. Destructions are incorrect.

Ditto what JK said according to Dave at SPA. When my gauge when south, they sent me a new gauge and thermocouple. But when I originally installed the gauge back in 2002, they were using 1/4" NPT. They switched a year or so ago to the 1/8" NPT fast reacting thermo. Kinda hard to go from 1/4" to 1/8", so I had to reuse my old thermo couple.

Thanks, I thought that was odd. I had never even heard of BSP before, and I see alot of stuff. You COULD push a 28TPI thread into a 27TPI hole, but it would start to bind hard after about 3 revs.

Apparently SPA has the some of the sending units on backorder right now. US hdqtrs said Wednesday is the next shipment.

I am hearing the 28th on senders. I have a few laying around if you need one.

Thanks, I thought that was odd. I had never even heard of BSP before, and I see alot of stuff. You COULD push a 28TPI thread into a 27TPI hole, but it would start to bind hard after about 3 revs.

Apparently SPA has the some of the sending units on backorder right now. US hdqtrs said Wednesday is the next shipment.

I remember reading the destructions the first time about two years ago and going WTF too on that thread size..... :confused:

I compared it to some existing stuff and the tap and figured I was good to go when it threaded in okay to the hardware I had laying around. :ro)

On page 17 of my manual from SPA says

PRESSURE: 1/8 BSP x 12.7 mm (will fit 1/8 NPT)