JUST FOR REFERENCE:
Defi pressure gauges use a BSPT thread type.
So if you're wiring up a Defi pressure gauge, you'll need a tee adapter.
BSPT Male = into engine
BSPT Female = oem pressure switch
BSPT Female = Defi gauge sending unit
Additionally... this part is NOT AVAILABLE in any country by any manufacturer.
However, there is a BSPT x BSPT x NPT adapter available.
THEREFORE, we must use:- BSPT Male = into engine
- BSPT Female = oem pressure switch
- NPT Female = Defi gauge sending unit with an separate adapter from the BSPT Defi sending unit to the NPT threads of the adapter.