GT535: what if we replace the engine with a pneumatic drill?

stinkwheel wrote:

My suggestion would be to do without a rev counter. You don't need one. Fit a nice clock in its place.

Quite happy to do that but Royal Enfield have made the speedo/tacho combo as a single unit with a propriety connector that drives both gauges. From what I've read, I'd have to partially recreate the circuit board that acts as base between the two.

In happier news, I've had a long conversation with Gemini and rifled through my spares boxes. I've managed to conjure up a signal generator that outputs roughly 3V peak-to-peak AC from an RP2040. The test program spits out a simulated 1000, 2000, 3000, 4000 & 5000 RPM (with the onboard RGB LED changing colour in sync, nice!) all verified with my oscilloscope. It can run from a USB power bank for testing so hopefully jabbing a couple of wires into the tacho will coax some reaction. I've also found a 12V to USB 5V converter - essentially the guts of a cigarette lighter adapter.

So that's power and output covered. For input I've got an optocoupler and some transient voltage protection components on order. Gemini assure me it's all piss easy, fingers crossed!
____________________
Royal Enfield Continental GT 535, ~~Husqvarna Vitpilen 401,~~ ~~Yamaha XSR700,~~ ~~Honda Rebel,~~ ~~Yamaha DT175,~~ ~~Suzuki SV650 (loan)~~ ~~Fazer 600,~~ ~~Keeway Superlight 125,~~ ~~50cc turd scooter~~