Spitfire 1500 rev counter

[lmdpth@lmd.ericsson.se (LMD/T/TB Peter Thorsen)]

Hi,

As I exchanged the 1300 engine in my Spitfire Mk3 with a 1500,
I kept the 1300 distributor, because the 1500 one is not
capable of driving the tachometer. However I have concidered
going for a 1500 distributor as well in order to get the right
advance curve. The question is, what drives the tachometer on
a 1500 engine? I understand that it is electrically driven, but
I don't know what it connects to.

 Thanks, Peter