hello everybody,

i have refurbished and upgraded my escort T25.
i have removed the injection wires, and fabricate a new one for marelli management.
i have installed a P8 ECU, map 3b, siemens 55lbs, etc. the plenum and throttle body still T25 because larger than T35 one.
T34 turbocharger with 048 exhaust part, and 70 mm decat exhaust pipe.
i have installed wasted spark system, with msd chip already programmed for it.
the car is perfectly running at 1,6 B for 360 hp.
on point still not working perfectly,
the tachometer give half rpm that the engine runs.
i have installed dual diodes on each way of the command of the coil. plus zener diode, but still the same.
someone have ever had this problem and could help me.

cheers