Smiths Tachometer RVI Buffer -542-
An external module to convert a voltage signal to current pulses suitable for the RVI tachometers.
73mm fixing centres
download installation instructions RVI Buffer.pdf (386kb)
External Module Converts Voltage to Current to drive RVI tachometers
If your classic car has had electronic ignition fitted, the tacho is misbehaving but otherwise is in good condition, or you don't want to upgrade the internals, this will solve the problem.
The module is voltage driven and can be driven from electronic ignition or from the coil -ve
The module outputs current pulses suitable to drive an RVI tachometer.
Less than 1W at peak rpm.
Five conections (by internal screw terminal block)
Tachometer trigger coil 1
Tachometer trigger coil 2
Note, for long term reliability we recommend a full conversion to voltage triggering for old tachometers as it replaces the old electronics. This kit utilises the original electronics in the current driven tachometers which in most cases will be ( for electronics) quite old having spent most of its life in a hostile environment.
to cover as many tacho inputs as possible there are two options for signal input voltage
to clarify how these are used depending on your set-up