New to me injection pump and head

[wilsonmotors]

I came across a injection pump that has a electric cut off switch instead of the normal pull cable and a new hh number I have never seen before anyone have any insight on it the numbers on the hh were HD 90111A and no I did not type that wrong it is 90111A

 

[gimpyrobb]

Possibly from the 565 trucks like bjorn has.

 

[wilsonmotors]

Any info on the 565 trucks