Car starts right up,no tach reading unless I rev the engine.It. shows signal about 2000Rpm mark and return to zero.After. a brief investigation the car does sound a it strange,but has plenty of power.Disconnected trails and made no difference in idle or performance,except popping and hesitation when I get on it.Mods are as follows. Street ported,micro tech ecu,stocktwin turbos,850cc primaries and 1600cc secondaries,walbro fuel pump and road tuned.Changed plugs and wires with no success.Problem still there.Maybe coils? Will check for signal and check ignitor?Any help please