[Healeys] Overdrive works switch

[PG]

The overdrive cars had the overdrive switch integrated into the shifter
knob.

 

Did this switch by-pass the switch on the firewall that is tied to the
accelerator pedal.(to ensure overdrive only turned off when revs of engine
increase) or was it used.

 

I've upgraded the accumulator piston and it would seem a waste to have the
response time of the overdrive impeded by the firewall switch.

 

Comments?

 

Thanks

Paul