Bongo Fury

Rev counter unresponsive when first starts then springs into life after a little bit.
Any ideas ? I'm thinking possible alternator failing, not putting out enough power until revs are at higher levels

Thanks in advance

I've had this twice on other vehicles, alternator both times.

Thanks Bob, yes I think the prime suspect has to be the alternator. Any ideas what the output voltage should be at tick over. I think that would nail it if low

No idea, sorry.

I have one of those Chinese made volt and temp displays with a USB that fits in the cigarette socket and it shows 14.2v sometimes up to 14.6 on tickover I think anything over 14.x volts is kosher (or even as low as 13.8v+)