Air cooled engines use CHT as well. Thanks for the help. I think I have a picture of which way I want to go.
That's because they have no Coolant to measure temperature with. I think we may have a terminology confusion here. I believe you mean a Coolant Temperature Sensor for the ECU. That's the normal GM part you mention. And the 280Z CTS is located in the Thermostat Housing.
You can use a 280Z lower thermostat housing and order the 12mm x 1.5 from GM. It will screw into the stock location for the Nissan CTS. The 280Z lower stat is rather hideous though and several of the threaded bungs won't be used.
I'm switching mine out for an early 240Z lower stat housing PN 11061-P0300 ( still available new from Nissan ) . ECU CTS sensor will go on the side where the threaded fitting is for the water inlet nipple. However you do have to do a modification. You have to TIG weld an extension bung onto the side. There is not enough clearance between the Thermostat and the probe on the sensor. So you have to space the sensor out about 1/2".
I believe that DIY only carries the 3/8 NPT GM CTS sensor, which is a bit bulky.
Here is a picture of the later style 12mm x 1.5 GM CTS. I would recommend ordering a genuine Delphi or GM part as I've found many of the aftermarket brands ( Standard, Wells, BW ) have considerable variance from the GM resistance specifications. Delphi or original GM sensors may cost a bit more, but they are dead nuts on accuracy wise. The GM part number is 12608814. Delphi is TS10076
Edited by Chickenman, 21 March 2017 - 11:24 AM.