Isuzu engine timing alignment method?

First, turn the piston of the first cylinder to the top dead center, and the intake cam and exhaust cam of the camshaft are in the lower figure 8. Then, the marks of the main gear, camshaft drive gear and fuel injection pump drive gear are aligned with the marks of the timing idler gear respectively. Finally, put the tray of high-pressure oil pump in the first cylinder for oil injection, and it will be OK to pick up the tray.