Got all gauges all working and set now so took out to try new gauges with shift light had shift light set to 5500rpm but as was getting there soon as got to 4780 revs they drop striaght to nothing then about 2000 revs on the gauges they are all set right and can hear the engine drop also.
Ive made sure the tach wire to dash is kept separate from other semders as it says and shift light does work as i re set to 2500 and they light up then.
The dizzy is a msd vac pro billet with a msd separate coil msd cables.
Carb is a 600 edelbrock.
Any one got any ideas why this is happening? Would help alot.