how to fix a tachometer (rev counter) on a 1.2 L 8V FIRE

[premrajeev]

Hey,

I owe a petra (Palio sedan) 1.2 EL .It runs a FIRE 1.2 8V MPFI engine,Magneti Marelli IAW 49F ECU controls the engine management.I never had a rpm meter in the original cluster but now i have possessed a cluster with rpm meter from a palio 1.6, anybody know how to connect the signal wire as i dont have a rpm signal from ecu in my wiring.. i have tried signal from crank sensor rpm works but engine stalls .. i've heard from someone tht there is a signal output for rev counter from ecu, anybody knows which pin it is ? any circuits ? any help on this will be highly appreciated . . I'm stuck on this for quiet some days, and dont want to experiment on the ECU as a fried ECU will be the result of a wrong connection . .

Any help from seniors would be highly appreciated ....

 

[dave]

this might help https://www.fiatforum.com/cinquecen...90-how-fit-rev-counter-cento-without-one.html

 

[premrajeev]

Hellow Dave,

I've tried almost all the wires from the ECU,bt nothing happens for good.The rev counter itself is working,removed it from the donour's car in a working fashion. I learnt from the forum tht the signal wire has to be connected to the fuel pump relay (dont know which terminal) but i fail to find the relay itself. Can i connect this to the coil inputs? because of the dual coils, is it going to give me a correct reading ? the FIRE 1.2L (1248 cc) 8v is used in many vehicles in many countries so any one shud b able to help ?

Thanks bro for the lead any way..

Alex / Dunc Anyone pls . . . .