Smiths Mechanical to Electronic Tachometer conversion -741-

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A Service to convert a Smiths RN tachometer to RVC.

Fits Smiths/Jaeger RN Cable Driven Tachometers

Many tachometers from the early 160s on not marked with the Smiths Logo

such as UK built Fords

Datsun ( built under licence in Japan)



Converts RN tachometers to Electronic triggering


This is a service to convert a Smiths mechanical ( cable driven) tachometer to Electronic, using carefuly chosen parts to give a period performance whilst appearing to look identical to the original mechanical tachometer from the front..


You will need to supply us with the original mechanical tachometer


We remove the needle and dial, discard the mechanical movement and replace it with a new electronic movement that uses "Air Core" technology. This type of movement offers substantial advantages over the older d'arsonaval movement fitted to the first Smiths Electronic tachometers, but the needle behaves in a very similar way to the mechanical tachometer so that it is almost impossible to tell that it is not original.

One of the advantages of this movement is that it is more than capable of operating the heavier needles found on the mechanical tachometers.

We do not paint touch-up or otherwise interfere with the patina of the original, apart from cleaning the glass.

Instructions on installation are included when we send the tachometer back to you.


Note - :   the new movement will cover the full rotation of the riginal mechanical tachometer, unlike our earlier conversions with restricted movement.


If the mechanical tachometer has a rolled on bezel, there will be a surcharge.

The conversion is negative earth

The conversion produces a clockwise tachometer unless specifically requested





Note, 1

It helps us to know what you will be using to trigger the tachometer so that we can calibrate the tachometer to suit.
please give as much detail as possible including triggering method, number of cylinders etc.



Note 2

unfortunately a customer recently sent us a tachometer through the post and it was badly damaged...

to protect the unit in transit, first cut out and tape a disc of something stiff (like hardboard or thick plastic) over the front

this will protect the glass ( I recently had a customer send one with an old CD taped over the glass.. ---  perfect  !! )

then wrap the whole thing in bubble wrap and put it in a box no bigger than 350mm x 250mm x 160mm  (UK SPECIFIC)

this is a special exception to the royal mail small parcel sizes..  it makes a big difference to cost..

Insurance is up to you...  personally the hassle of trying to get money out of the post office is more trouble than it is worth..

so I generally go for a signed for service.

If your tachometer is very valuable use a special delivery service, please let us know and we will do the same in return.
Remember to include at least a clue as to who the tacho is from !!   and an indication of how many cylinders for calibration purposes




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