Yes Bruce,
Situated below but slightly forward of the iskra power unit
but just above the 2 fuses covered by a rubber cover.
Switch the truck of at the key switch, hold the rubber cover switch down, switch the key switch on, the steering will shimmy a few times keep holding the switch down The BDI gauge warning light will momenterally go red then green. Switch the truck of at key switch leave for thirty seconds, Switch truck back on this should now have cured problem.

Titus