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'67 Jaguar E Type Series 1.5 4.2 2+2: rev counter, high beam and horn stop working together occasionally

Good morning everyone.
For some time now the rev counter of my E Type has been occasionally stopping working, remaining at "zero revs", then restarting and stopping and restarting occasionally without any logic. I noticed by chance while driving at night, that when the rev counter stops working, the high beams also do not work, and the horn also stops working. When the rev counter restarts, the high beams and the horn also start working normally again.

Can anyone give me directions on what and where to check and fix it?

The competent classic car workshop that I normally go to in my city (Modena Italy), has done checks without finding the reason (during their tests "obviously" the case has never arisen... ); unfortunately in my area the "Jaguar E" are not very widespread and equally, the experience of the workshops, much more prepared for Porsche, Ferrari, Maserati etc.

Thanks in advance for any suggestions.
Maurizio

Examination of the presumed correct wiring diagram (there are several variations for different chassis numbers) suggests that the fuse box and more particularly fuses 3, 8, 6 and 7 may be a good place to begin looking for answers. Try looking for corrosion or signs of overheating here and if any is found, it may be a good idea to renew the fuse boxes to rule out the dangers from such issues. Mike.

Examination of the presumed correct wiring diagram (there are several variations for different chassis numbers) suggests that the fuse box and more particularly fuses 3, 8, 6 and 7 may be a good place to begin looking for answers. Try looking for corrosion or signs of overheating here and if any is found, it may be a good idea to renew the fuse boxes to rule out the dangers from such issues. Mike.

Thank you Mike.
I will check following the suggested checks. Kind regards, Maurizio