Analogue Tachometer Driver Board -948-

In stock

A tachometer module to drive moving coil tachometer movements.

Installation guide.pdf (182 Kb)

(note these instructions are for the boxed version which is identical electrically)

External Module Drives Analogue Tachometer Movements ( 2020 version) Board Only

All new electronics replaces old circuit board

High quality ceramic capacitors for long life and temperature stability.

If your classic car has had electronic ignition fitted and you tacho won't play ball, this will solve the problem

Based on the LM2917 but with spiyda's own additions

Uniquely, this unit can be calibrated from a PC, Laptop, iPhone etc. using the calibration cable

No need to intall software, just a simple wav file.

If you are fitting the module yourself, order the optional calibration cable.

Dimensions      47 x 32 x 17mm

This module is the same board as in our extarnal module but unboxed. The terminal blocks are mounted at the extreme edge of the board and can be used as a mounting by hot glueing them to ( for example) the back of the dial. ( industrial double sided tape can be used but is not included) It is also suitable for non-smiths tachometers with a moving coil movement.

This is the least DIY solution as it will require ingenuity to mount the board in a safe manner. It is included as it does provive a means of repairing tachometers such as the later RVC tachometer keeping all the changes inside the case.

The board is negative earth and will convert positive earth tachometers to negative earth -

It is however possible to install on a positive earth car, read the FAQ if you have a positive earth car



Videos of the tachometer board on YouTube  (not all are applicable to this model)
RVI to RVC 1 dismantling the tacho
RVI to RVC 2 fitting the circuit board
RVI to RVC 3 powering up the board
RVI to RVC 4 calibrating
RVI to RVC 5 alternative connections

More information


Tachometer Wiring

Tachometer Calibration


Note, 1

to cover as many tacho inputs as possible there are three options for signal input voltage

to clarify how these are used depending on your set-up

for calibration with an audio signal the low voltage input should be used
if you have a tacho output. from an ECU or ignition module, the low voltage input should be used.
if you are connecting to the -ve of the coil, select the high voltage input 
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