I have designed an Anemometer circuit using a reed switch (pulsed DC) anemometer which will hopefully activate a relay linked to a LM2907.
Could anyone give me any advice on how to fine tune this circuit?

 

You have another thread open on this same circuit - http://forum.allaboutcircuits.com/showthread.php?p=373233#post373233

You are not giving us anything to work with. What is the relay for, and what do you mean by "fine tune"?

 

I assume the reed switch is pulsed by a rotating vane and the relay operates based on frequency set-point.
Your diagram indicates that frequency is inversely proportional to R and C, therefore adjust one or the other.

pilko

 

The relay will never, ever energize.
How much current is going to flow through the output transistor with a 10k resistor in the emitter leg?
Assuming your relay draws less current than that transistor is rated for, just ground the emitter.
You also need a commutating diode across the relay coil. Inadvertantly that 10k resistor Homered by protecting the 2907 from buying the farm because it wouldn't allow the relay to energize.