Rover V8 Compatible Tachometer

AntonZdz · Post by **AntonZdz** » Wed Nov 28, 2012 9:01 am

All

Would the below tachometer be compatible with a 3.9 Carbed Rover V8.

http://www.ebay.co.uk/itm/271093205330? ... 1423.l2649

Thanks!

kiwicar · Post by **kiwicar** » Wed Nov 28, 2012 9:59 am

Hi
Same basic gauge but from McGills and £5 cheeper (ok the face is a different colour). http://mcgillmotorsports.co.uk/index.ph ... ductId=581
They deliver within 2 days normally and offer proper product support.
If it were me. . . I would go with McGills, and I do buy alot of stuff direct from China.
Best regards
Mike
Sorry editd to put the link in! makes a little more sense that way!

DaveEFI · Post by **DaveEFI** » Wed Nov 28, 2012 11:00 am

AntonZdz wrote:All

Would the below tachometer be compatible with a 3.9 Carbed Rover V8.

http://www.ebay.co.uk/itm/271093205330? ... 1423.l2649

Thanks!

Doesn't give any information on how it's driven, does it? Modern cars have a low voltage pulse from the ECU - older ones commonly a high voltage one from the coil negative. Should be possible to design one to work from either, though.

AntonZdz · Post by **AntonZdz** » Wed Nov 28, 2012 2:47 pm

Awesome thanks for the link, will get the McGill one, I only need the motor inside anyway as its going to be driving an original needle over a new facia.

Thanks guys!

bodger · Post by **bodger** » Thu Nov 29, 2012 10:30 am

AntonZdz wrote:Awesome thanks for the link, will get the McGill one, I only need the motor inside anyway as its going to be driving an original needle over a new facia.

Thanks guys!

Call mcgill first , they do say on their ebay ad that the rev counters DON'T work on rover V8's so worth a call first ...
i did and they said NO

stevieturbo · Post by **stevieturbo** » Thu Nov 29, 2012 7:20 pm

Bit of a generic thing to say they dont work on RV8's

Given they dont know what ecu, what ignition system etc and the fact they've been used over a 30year range.

A bit more info as to what they do require to make them work would be better, or reasons as to why they dont work with a RV8, which again is very dependant on exact model they are referring to.

DaveEFI · Post by **DaveEFI** » Fri Nov 30, 2012 12:05 am

Perhaps they're only suitable for 4 cylinder engines?

stevieturbo · Post by **stevieturbo** » Fri Nov 30, 2012 1:06 am

I guess it's possible. But any aftermarket rev counter I have ever seen are all switchable for various cylinders.

Although none of them were cheap chinese stuff. Or at least not cheap modern chinese stuff...

Might have been old, and who knows where they were made lol

bodger · Post by **bodger** » Fri Nov 30, 2012 9:45 am

stevieturbo wrote:Bit of a generic thing to say they dont work on RV8's

Given they dont know what ecu, what ignition system etc and the fact they've been used over a 30year range.

A bit more info as to what they do require to make them work would be better, or reasons as to why they dont work with a RV8, which again is very dependant on exact model they are referring to.

quote taken from McGills site :

Suitable for 4, 6 or 8 Cylinders , but will not work on Minis ,Land Rovers or any British Leyland vehicles or diesel Transit vans !!

Ideal for coil ignition systems ,ECU's ,W Terminal Alternator feeds or Crane/MSD Electronic Ignition systems.

It will not work on multi coil ignition systems

DaveEFI · Post by **DaveEFI** » Fri Nov 30, 2012 11:16 am

Love to know what's different about a standard Lucas points/coil system?

DaveEFI · Post by **DaveEFI** » Fri Nov 30, 2012 11:22 am

Just to add I had problems with my SD1 tach when I changed to EDIS8. The original was Lucas DLM with the dizzy mounted amp. I tried all the various diode circuits shown with both pull up and pull down resistors. And the transistor firing a relay coil. Non was perfect. Eventually changed the movement driver inside the tach to a design I found on the net, which works off the EDIS tach feed.

bodger · Post by **bodger** » Sat Dec 01, 2012 11:57 am

DaveEFI wrote:Love to know what's different about a standard Lucas points/coil system?

yes me too , i found a really basic one on ebay in the end and it works fine ...

1 power
1 earth
1 signal from the coil neg ... simples !

SimpleSimon · Post by **SimpleSimon** » Sat Dec 01, 2012 7:00 pm

DaveEFI wrote:Just to add I had problems with my SD1 tach when I changed to EDIS8. The original was Lucas DLM with the dizzy mounted amp. I tried all the various diode circuits shown with both pull up and pull down resistors. And the transistor firing a relay coil. Non was perfect. Eventually changed the movement driver inside the tach to a design I found on the net, which works off the EDIS tach feed.

Same here

the 4 linked diodes from the LT side of the coil's trick had my Tach spiking all over the place eventually sorted out by a Tach converter that takes its input direct from the IDM pin on the EDIS 8 module and is now sound as a pound and accurate too

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