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Disassembly
The Motometer instrument was opened. A knife blade was inserted between the bezel and the metal of the body and this was followed by a small screwdriver. This was worked round the circumference of the meter body until the bezel could be removed. This allowed the machinery of the original meter to be removed.
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Mounting
The diagram (Not to scale) shows how the Lascar meter module (shown grey) was mounted in the Motometer instrument casing (shown green). A piece of flat alloy was cut to match the shape of the rubber splash guard supplied with the meter. This was drilled centrally to take the mounting stud of the meter and two further holes were drilled towards the two ends. These were countersunk to take 3mm brass screws. Two hexagonal spacers (brown) were cut to 12mm long. The spacers I used were internally threaded to 3mm. These were threaded onto the brass screws so that they were rigidly fixed to the mounting plate. Two holes were drilled into the bottom of the casing to match the two screws. |
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The splash guard was attached to the mounting plate using the self adhesive pad supplied and the meter was mounted to this.
A circular face was made from a piece of sheet plastic (plastic card available from modellers shops is ideal). A rectangular hole was cut in it to match the face of the meter module. The face was painted matt black and marked on the front using 'rub down' lettering. It was attached to the front of the module using double sided tape.
The very thin positive wire from the meter was soldered to a thicker piece of wire. The negative wire was attached to a ring terminal and to a thicker piece of brown wire.
The assembled module was lowered into the casing, the ring terminal being put onto one of the screws and an equivalent thickness washer onto the other. The wires were passed through one of the existing holes in the bottom of the case and the brass screws passed through the holes drilled for them. Brass nuts were used to fix the module in position and the whole was very rigid. |
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Reassembly
The bezel and glass was cleaned then it was placed back into position on the case. The whole was then gently compressed in a vice to push the bezel into place and compress the rubber sealing ring. A piece of scrap wood was used to protect the bezel and a socket was used to space over the mounting studs. A piece of wood was then used to tap the bezel back into it's original shape sealing the housing. As a final touch, the bezel was given a coat of matt black paint.
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