Diesel tachometer on petrol engine

[cosmin_cosmin_1]

I'm trying to fit a dashboard from a diesel mk2 into my petrol mk1 corsa A/nova. I made everything work except the tachometer. On idle, it shows around 250rpm instead of 750-800 rpm.
Does anyone knows how can i modify (if possible) the tachometer that i have in order to show the correct rpm?

[mowgli]

yes, unfortunately you either need to remove it and swap for a petrol one, or fit a diesel alternator and the correct pulleys, as i'm positive that is where the diesel rev counter trigger works from.

[cosmin_cosmin_1]

i hoped i can replace some resistor/capacitor on the pcb

[davidfox280585]

just fit petrol clocks instead of diesel ones simple

[mowgli]

i hoped i can replace some resistor/capacitor on the pcb

a good electronics person could make you a piggyback circuit, but getting it accurate may be difficult

[cosmin_cosmin_1]

here, in romania, you don't find any parts to buy for corsa a/nova. it wasn't a common car, so it's very difficult to source parts like that.

[AlexW]

Beats a dacia :p

Your best off finding somone with petrol clocks over here that is willing to break them.