Tachometer Lowering when Lights on ?!?!

[bmouthboyo]

As the title really. I fitted this Rev counter a few years back I think just from a terminal on the coil and a negative (4 years ago so could be wrong).

Now I noticed this happens:
https://www.youtube.com/watch?v=Ejd_SgAtlMo" onclick="window.open(this.href);return false;

Anyone know what this might be?

Cheers

[slowcoach]

As the title really. I fitted this Rev counter a few years back I think just from a terminal on the coil and a negative (4 years ago so could be wrong).

Now I noticed this happens:
https://www.youtube.com/watch?v=Ejd_SgAtlMo" onclick="window.open(this.href);return false;

Anyone know what this might be?

Cheers

I believe its an extra earth path opening up via the lights. My temp gauge goes up by 2mm with lights on, which I've guessed is the above reason. although I don't know anything about rev counters really.

Clean your earth connections might help?

[bmouthboyo]

As the title really. I fitted this Rev counter a few years back I think just from a terminal on the coil and a negative (4 years ago so could be wrong).

Now I noticed this happens:
https://www.youtube.com/watch?v=Ejd_SgAtlMo" onclick="window.open(this.href);return false;

Anyone know what this might be?

Cheers

I believe its an extra earth path opening up via the lights. My temp gauge goes up by 2mm with lights on, which I've guessed is the above reason. although I don't know anything about rev counters really.

Clean your earth connections might help?

OK I'll look into that. Would an earthing block direct to battery negative help? I can't remember how I wired this up now.