I hadn't thought of getting a stock tach - great idea!

I got my engine used from ebay. The timing belts are supposed to be replaced every 5 years/50,000 miles or something like that. My engine is probably 15-20 years old so I changed them. It seems the injection pump is supposed to be timed after changing the belts. It looks pretty simple with the factory tool which I don't have. I think I can make a dial indicator adapter that will work.

My engine came with glow plugs but I think they are worn out. It is very smoky until it is completely warmed up. Either that or I have a more serious problem. The engine oil breather blows a fair amount of vapor under boost, which may mean ring blowby. I will do a compression test when I change the glow plugs.

This is the injector pump.