240 L4-2127cc 2.1L SOHC B21A (Can) (1984)
NOTE! On B21-23 turbo engines, the easiest place to measure the oil pressure is at the rear of the cylinder head, using nipple 16218-0.
A 10 percent lower pressure will be obtained when it is measured via the port at the rear of the cylinder head.
Coat the plug with locking fluid before refitting.