I'm trying to figure out how to hook up my autometer oil pressure sender and still keep the OEM oil pressure switch functional. The oil pressure sensor has a 1/8" NPT male fitting. I believe the OEM oil pressure switch hole is M16X1.5. What I think I need is simliar to the Stillen SC oil line setup. Instead the line going to the SC, it will just end at my oil pressure sender that's mounted on the firewall.

 

It uses a T and 1 metric/NPT (for block) and a NPT/NPT (4AN oil line)male couplers... At least I think it was NPT. It connected to 4AN fittings. You can order the parts from Stillen (about $15 total)

 

Where does the OEM oil pressure switch go on a SC car? On the brass T block? I would imagine the T block has (3) 1/8" NPT (female) holes.

Autometer does sell a 1/8" NPT (female) to Metric (male) adaptor. Which I can use for the block? But I haven't seen any Metric (female to 1/8" NPT (male), I would need this fitting to mount the OEM oil pressure switch into a 1/8" NPT hole.

 

I got mine water temp sender to work. It's not pretty but it works. No welding equipment so I had to use JB weld. A ground connection was needed for the sender.

http://photos.imageevent.com/1max2nv...e/Dcp00943.jpg

 

Yes, the OEM sender goes into the T pointing toward the passenger wheel while the -4AN line goes to the T facing the rear of the car (The line has a curved end, though)