Rev Counter, wiring & Electronic ignition

[Johno99]

Since installing an electronic ignition system my rev counter has stopped working and I have had to install a new feed wire as the existing wiring had no current. Any ideas on how to get the rev counter working again? Thanks

[mallardstag]

Since installing an electronic ignition system my rev counter has stopped working and I have had to install a new feed wire as the existing wiring had no current. Any ideas on how to get the rev counter working again? Thanks

Hi John,

If you have an early car and your rev counter is an RVI current sensing type (inductive type with letters RVI on the face) then you are unlikely to get it working properly with electronic ignition, you will need to have it converted to the later voltage sensing type. There are several people who can do this for you if you want to keep the original look or you can have a go yourself.

You could also replace it with the later RVC (voltage sensing) type, although the face will not exactly match MK1 instruments unless you swap the internals over.

There will also be a small wiring change as the RVC tacho no longer needs to be in series with the coil +ve feed.

More explanation here http://www.gomog.com/allmorgan/smith...conversion.pdf and here http://www.super7.dk/instruments.html

These people can supply RVC tachos (and I think can convert RVI types) no doubt he'll be alang as he's a poster on these boards. http://www.thegaugeshop.com/shop/cat...am=ecid%3D2%26

Also here http://www.jdo10.pwp.blueyonder.co.uk/page3.html


Simon

[elvimto]

Hi John,
be careful with this one my car was owned by the same guy for thirty odd years he had the points removed and electronic ignition installed it is a MK 1 he told me the tach quit years ago when I started working on it I found the inside of the tach completely fried and the white/slate wire from the coil had melted the insullation right through to the other wires in the loom, thats when I found out about the Mk1 and Mk2 tachs being different.It must have seen a large current to melt the plastic. If you have a Mk1 change out the tach to Mk 2 and check your wiring. As discribed above help will be on the way.

cheers Stuart

[WealdenManinKent]

Hi,
I was just about to look at mine, this is a very useful thread, I wonder how many others had same problem??
Roger

[mallardstag]

Speedy cables http://www.speedycables.com/repair.html may also be able to convert your tacho.

From their website

We can convert your existing electronic tachometer for use with an electronic system/sports coils. We would require the gauge to be sent in with confirmation of number of cylinders, once upgraded, the tachometer can be used with the existing points system or a new electronic system/sports coils, which you may fit at a later date. The charge for this service is from £65.00 plus carriage and VAT.

Simon

BTW No relationship with any of these suppliers.

[Mij]

Hi Guys, Like Johno99, my tacho has not worked since buying my stag some years ago. It has got electronic ignition so I was very interested in the thread, but I am not sure what to do now. Can anyone help.
Firstly mine is a 1972 stag, nominally a Makr 1, with a few Mark 2 features, standard engine, except for the electronic ignition. I have removed the tacho from the car, and it is shown on the face as a "RCV 2811/OOAF 12 Volt Negative earth", but looking at the Haynes manual ther are four connections to the back (excluding the lamp). These are 1. green wire, 2. black wire, 3. white wire, 4. white/slate wire. But the rear of my tacho has only three connections, a bullet and a terminal connection in a small window opening in the case and a terminal connection welded to the casing. To these were two wires, one to the bullet terminal and one to the casing. There was a wire hanging loose, but this is green.
Do I just connect the green wire to the empty terminal in the window, as indicated by the Haynes manual, and try it, or is there a more scientific, and safer way to follow?
Thanks

[Staggard]

Alan (157.7) is the man you need for this he convert's Mk1 tac'os also keeps it in the family. Graham

[Mij]

Thanks Graham, but I am at a loss as to who is Alan (157.7)? Is that his username? And how do I contact him?
Mike

[milothedog]

Thanks Graham, but I am at a loss as to who is Alan (157.7)? Is that his username? And how do I contact him?
Mike

Back pages of the club mag, he has an advert for Stromberg Carb's

Ian

[Bob Heritage]

You will find Alan here www.thegaugeshop.com