WEIRD REV COUNTER/TEMP GAUGE PROB

When I switch my headlights on my rev counter and temp gauge stop working

I thought it was the headlight switch because when I messed around with the dimmer switch above it the rev counter kept flicking back on

Replaced the headlight switch with a brand new one and still the same problem

 :dontknow:

i having the same kind of problem, my light switch broke and rev counter and oil light, indicator light ect on console have stoped working, light switch sorted but rev counter ect have not????

any electric geinusout here know if its related?

cheers

It sounds like an earth fault

Im no electric genius (useless comes to mind)but as the only link i can see between the headlights and rev counter/temp gauge is the instrument lights using the same earth
Fuel gauge still ok with lights on?

if you disconnect the instrument lights does it do anything?3 bulbs on back of clocks 1 black 2 white

When you first noticed it had you worked on any area of the car just beforehand ?

Just had a thought .
Does the headlight switch illuminate with the ignition on and the switch off?
On the headlight switch connector there is a brown earth wire going to the bulb, try disconnecting the brown wire.

Its a shot in the dark and should in theory not do anything ,but theory and Mk1 electrics dont go together it would appear

jiust answered this on your other thread jooles