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MG MGA - Help: Electronic Tacho / Rev Counter Problem

Hi guys,

the car is nearly there. Hopefully up for its first MOT in about 40 years, in a few weeks. However I have a slight niggle...

I have a Lumenition optronic electronic ignition system on it and as such have fitted an alternive rev counter (RVC2415/00AF), the same as Steve Gyles has on his. However, unlike Steve, mine is reading about twice the revs, e.g. a slow lumpy tickover (estimated 750 revs) is reading a happy 1500rpm.

Any thoughts, similar experiences, fixes?

Cheers,

Grant :-)

PS I know this isn't required for the MOT, but it's annoying the hell out of me
G Hudson

Grant

Strange one. I assume yours has 2 wires? How have you connected them?

I have been trawling the web and it seems numbers of people have had trouble with their tachometers after fitting the Lumenition system. However, these have been with the RVI version and Lumenition advised customers to change to the later and much improved RVC variant - so that does not really help you.

For what it's worth I use the Aldon Flamethrower (UK Petronix) and have never had a problem with my RVC. Just 2 wires to connect (ignition circuit and coil negative terminal) and earth the case.

Steve
Steve Gyles

Steve,

earth the case? That's probably where I've gone wrong, as I've just connected the two wires up.

I'm away from the car for a while, but I'll give it a go and report back.

Many thanks,

Grant :-)
G Hudson

Grant

The bracket that holds the unit to the dashboard achieves the earthing.

Steve
Steve Gyles

This thread was discussed between 23/09/2011 and 27/09/2011

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