Re: Electric Tach question

["The Falcon Glen, TFGTV" <matt@tfgtv.freeserve.co.uk>]

As I said previously the simple way to do this is to get someone who's
skilled at electronics construction to build a simple divide by 2 circuit
on a piece of veroboard or similar. Dividers are standard ICs and the only
other components would be input and output buffers either in the form of
single transistor amplifiers or operational amplifiers.

Any first year electronics student should be able to rig up such a circuit
for you.

Since a tach does not measure a linear quantity like pressure or level, but
a frequency, there are no 'scaling resistors' or suchlike. Essentially a
tachometer is measuring the number of pulses in a period of time.

Matt