Originally Posted by yragat
I there such a thing as metric pipe threads? what I want to do is use nissan gages with a chevy motor. Will the nissan oil & water senders screw into a chevy? If not where can I find adaptor fittings?
Yes, there's a difference between US pipe threads and metric. The ISO metric specs adapted the British Standard Pipe thread series instead of NPT, and the thread pitches are slightly different. For example, 1/8 NPT has 27 TPI and metric has 28 TPI. Very close, but different. Adapters should be available from the gauge manufacturers.