speedo converter needed

[Peter Gargano]

I don't have one, but..

A simple frequency converter, as described below, isn't a simple thing to
do accurately. An easy, all analogue way, is a frequency to voltage to 
frequency converter. The bit in the middle could have a "volume" control
to account for gears, tyres, or whatever - perhaps even with switched 
variable resistors that need be calibrated just the once.

A more complicated, but more accurate way involves a PIC (etc.) ...

Mike Pilkenton wrote:

> Does anyone have a simple frequency converter circuit that could be used to
> calibrate a typical inductive pickup signal to the proper frequency based on
> different tire and gear ratios?  I envision a circuit that would use the
> stock pulsed signalk from the tranny and then provide a fine tuning trim pot
> that would vary the frequency up or down based on the above parameters.

-- 
Peter Gargano