Smiths Tachometer - RPM Drops to 0 when it passes 3000rpm

[Skeete]

Just purchase the RVC1006 smiths 8k tachometer.
Wired it in as per instructions - Red/Black to - on Coil

Car starts up fine, revs up to 3000k then drops like a stone to 0 then picks back up again.
It I build the revs slowly it does the same thing.

Its a negative grounded, on points, Classic Mini 1962 A Series with an MG 1098 engine.

I have the DipSwitches on the back set to 2 PPR which I think is correct according to instructions.

On|On|Off|Off|Off|Off|Off|On

As per instructions it says to always leave Dip8 as On.

Here is a link to the instructions :
https://www.7ent.com/pages/installation ... meter.html

Any advice on why this may be happening?

Thanks

[Herbert]

I'm almost certain that you have a duff rev counter.

[Skeete]

I am wondering if it could be a ground issue or if I have interference on my 12v supply. Will try to a run a longer ground cable to the Engine ground so see if that helps, maybe hook up the volt meter to check for any oddities when I rev, but its digital so its fairly slow to react.

Barring that, I am at a loss.

Have read a post somewhere else about the same issue, and that the unit was returned and verified as working as intended then sent back to the end user, but there was no conclusion to that post.

[Peter Laidler]

Maybe you could put electronic tacho problem into the search facility (top right) and see what it brings up. But really, a ground issue will manifest itself across the board

[Skeete]

I already did search and found nothing of use.

[mk1]

In my experience those new Smoiths tacho's eithewr work right or they don't. It could be a weird interference issue, but I bet it is the tacho that is duff.

Give Caerbont a ring.

[Skeete]

[FIXED]

The solution was simple. I checked the voltage stability and it was good, so I rewired with a better wuality piece of cable and soldered the connectors on the ends and heat shrinked them.

This was the solution. I think the original wire I used was either not connected well enough, was too low a quality or was getting interference.

So if anyone else gets this problem, make sure your wires are good quality and has soldered on connectors.

[mk1]

Great news!

I love an easy fix.