I´ve found the solution.
I have to replace the internal mechanisms of the cluster for the Zetec V4, meaning Tach, Velocimeter and Gas gauge.
They all interact in questions of resistance and voltage, because they are interconnected behind the cluster. The Temp Gauge is the same for all, that´s the only one that stays.
Thanks to my Ford dealer tech support.
BTW,some parts are Canadian and some are US made.
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Zetec V4
K&N air filter
Tornado air system
Nology Hot Wires
Double platinum Sparks
Eagle GA tires
Ventilated Titanium Discs
Infinity Kappa series 4-6x9-200W
1 Infinity Basslink Subwoofer 200 W RMS
MTX Bluethunder Amp. 100W x 4 RMS
And very soon Full Ebaich Kit.