to get the gauges out of a b310 you have to remove the dash panel,which includes undoing the 12 mm nuts holding the radio in,popping the heater control panel out to get to the two
screws under there,popping out the rear window demister & dash light control,plus the choke cable.you then have the three screws along the top of the panel,plus the two under the dash panel,& the one on the side next to the driver door.oh,& the ones holding the ashtray panel,& disconnect all the wiring.just take your time & always assume there's something else holding it in until you've double checked everything is free.you also have to remove the steering column surround so you can get to the two bolts holding the steering column up,because you need the extra space to get the dash panel out without breaking it.you sure the dash light reostat isn't turned down so there's no dash lights.