Need Help to Wire New Fuel Oil Pressure Switch

[CapetaniosG]

Finally received my new pressure switch. It took Federal Depress 12 days to fly it over the Atlantic to
Greece at a cost of $80 dollars !!!! Learned my lesson. Next time I'll smuggle it in myself !!!!

Now I'm ready to install and need your help. The new switch FP-23520024 has three poles labeled NC (Normally Close), NO (Normally Open) and C (Close ?). The old switch had two poles with two red wires attached to one pole (Hatteras wires No. 177 from the Battery Charger and wire No. 171 from the Field Relay) and a third red wire (No. 19 from the Starter Solenoid) attached to the other pole.

My question is what No. wire goes to which pole of the new switch? Would appreciate your help.

 

[osprey]

On mine, I use the NO and the C. This would then close when the fuel pressure comes up, making the connection to (in my case) apply power to start the hour meter and apply power to the system monitor.

P