Electronic rev counter...

[Chris KC]

"Late Ruby" - to save me working it out, is that on a 5.125:1 axle Colin?

[Colin Morgan]

Yes, it is one of the very late 'heavy' type.

[dickie65]

I have an Autojumble find 0 8000 Rpm Tacho fitted in place of the fuel Gauge on my EB65 my petrol gauge is now a Teak notched stick.
Mine Tacho suffers from points bounce and becomes erratic at high revs. I have seen 6000 RPM in fourth gear a couple of times. ( when the points are not bouncing )
My Tacho is a 1960s style face with chrome bezel so it looks a little out of place.
Wiring it up was really simple as it takes signal from the points side of the coil only two wires.

[Ianfrancis]

Hello
Has anyone found a solution to get a Tacho working on a magneto engine. I have tried one of the cheap inductive type with a wire looped around a plug lead but the display jumps around too much?
Thanks

[A G Wood]

Hello
Has anyone found a solution to get a Tacho working on a magneto engine. I have tried one of the cheap inductive type with a wire looped around a plug lead but the display jumps around too much?
Thanks

I've never tried (maybe some one has?) but what about picking up the points open/close waveform from the primary circuit at the cut-out switch and using that to drive a tachometer-particularly one of the 1960's Smiths RVI/pulse types that don't physically connect to the primary circuit? Or does the intrinsic primary current reversal mess this idea up.