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Right on the graph disc having to be in or the tachograph gets messed up David. However, if you don't need the graph (general handling of the tachograph while on the bench or non-commercial ops.), Argo makes a teflon disc that keeps the stylus from being damaged. That's what's currrently in mine...

Bjorn The clock is electric and is set by opening the face to get at the adjustment knob. The tachograph and all the gauges are internally lit-- the panel lights are just to keep the mil. veh. dash panel look. The low air warning light and the high beam indicator will be functional though.

Thanks for the kind words Bill, the additional quarter-sized holes are for gauge illumination, a low air warning and a high beam indicator. In addition to a standard gauge set plus an addition temp. for trans., the three down the left side are exh. temp., boost, and dual needle air pressure (one...

Oops, let's try this again.

These Argo tachographs are in the M900 series trucks as well as the HETs. Here's some shots of the one I put into the baby HEMTT dash.