I need:
3/8" bsp x 1/8" pt reducer bushing
To mount an oil temp sensor in the top of my aps oil pan where the second turbo oil return would've been.

And

3/8" pt x 1/8" pt reducer bushing
To mount a new water temp sensor in the extra bung of my pathfinder rear coolant pipe.

Thanks for any help. I've already googled it and searched locally.

This is what it should look like, I just can't find the right size.

 

http://www.ebay.com/itm/Brass-Hex-Bushing-Reducer-3-8-Male-1-8-Female-Speed-Tech-/400444717268?pt=Race_Car_Parts&hash=item5d3c5d78d4&vxp=mtr

 

I assume you need an NPT fitting for the second one. Lowes or Home Depot likely has that. McMaster-Carr carries a variety of them, in various materials and pressure ratings. Here's one in brass for low pressure:

4429K471 (Search mcmaster.com for that part number)

If you want to see all of them, just search for reducing bushings and use the parametric search from there.

For your other fitting, I couldn't find any single fitting, but if you have room, you can these:

4860K143 (that's a 3/8 BSPT Male x 3/8 NPT Female) + 4429K471 (Same 3/8 NPT x 1/8 NPT bushing as above).

Hope this helps.