Any ideas what could cause this?

I am running a new 3 gauge cluster and have run a new wire to the -ve of the coil. Works fine till 2500 and then wont go any higher. The motor is definitely revving past 2500, just not the tacho. I noticed this on a previous temporary tacho i had but thought it was a dodgy tacho. Now im stumped.

Im running a bosch gt40t coil if that helps at all

I,m no auto sparky but this might help

http://www.theminiforum.co.uk/forums/in ... opic=39286

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Whats the car idling at?

Its idling around 800

Look at your points and / or condensor in the dissy.

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Thanks for the advice. Checking the points is out of my league of expertise unfortunately. I did have them replaced when I got my car registered a month go though. Hadnt had a tacho in the car before that time so dont know if the issue existed beforehand.

Ill keep trying a few things or else have to get my mechanic to have a look next time

go for a damn good fang on a really rough rally road,,, full of big bumps & jumps & go really really fast so the whole car gets banged & bumped around really hard

that`ll fix it



& you think i`m kidding ???

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Any chance it could be my coil? I have a transformer type GT40 and with my previous tacho the needle was jumping all over the place which I assume means the voltage was all over the place. Can the internal resistor conk out causing the voltage to jump up and down.

Thinking I might buy an oil filled GT40 and see if that helps first.

You dont have any other cars you can test the tacho in do you?

Well its been the same issue with 2 different tacho's now so Im confident its not the actual tacho but an issue in my electronics somewhere.

Its an odd issue but Ill try a few things and see where I get

If it is an aftermaket gauge...it will have a "4..6..8" switch on the back.

We had one once that had the 4..6..8 switch wired in reverse.

Sounds as though it it registering for a 6 or 8 Cylinder...check the switch .

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1974 1150cc Leyland Mini S racer,
1975 No motor Leyland Mini "ute"
1991 IPRA Honda Integra (in the build)
1995 Land Rover Discovery 300Tdi

CAMS Scrutineer

Forget looking at anything else for the moment,


This is where the problem will be.

OK well I will get my mechanic to have a look next year on its next visit. I wouldnt know what to look for.

Probably worth just spending the money on electronic dizzy conversion anyway

Ya accelerator cable is too short

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1964 Cooper UK 970 S 'CZ 4289'