Capacitors on reverse speedos
 

Is it ok to do this?

cheers

westw00d

Doesn't the capacitor get fitted to the battery end? In which case the polarity won't change so it should be just fine. Alternatively, you could get a non-polarised capacitor.

On the subject of power caps. What is the usual spec, capacitance and voltage? There is someone on Ebay selling them at around £4 for something that I could probably get from Maplin for well under £1, that's a tidy mark-up.