Hi damo on the new 115 reach truck it is pre wired under the foot plate just plug in a rvs buzzer and job done.
On your truck the LINDE way is to put a wire from the module to a relay,then to buzzer,but you may need a laptop to switch on rvs buzzer through module,only down side to fitting across contactor is when braking in fwd the buzzer can sound but if customer is happy thats all that matters.
herald.
ps used to do lots of fishing in Ireland on the shannon at Rooskey+Carrick