Rev counter

TomMGBGT · Post by **TomMGBGT** » Thu Aug 05, 2021 11:39 am

Hi there can anyone assist, on starting my BGT 77 Model the Rev Counter doesn't,t operate but after a few minutes it works normally any suggestions appreciated.

Not_Anumber · Post by **Not_Anumber** » Thu Aug 05, 2021 12:39 pm

Has it been like this for a while or did it start following some recent work on the car ?

TomMGBGT · Post by **TomMGBGT** » Fri Aug 06, 2021 4:02 pm

There,s been no work on the car only engine tune up

Ian F · Post by **Ian F** » Fri Aug 06, 2021 4:53 pm

Different ignition system fitted? Tachometers work on ignition pulses.

Ian F

Vic Butler · Post by **Vic Butler** » Fri Aug 06, 2021 9:02 pm

I always have to tap the glass to get my rev counter working. Have done so for years.

TomMGBGT · Post by **TomMGBGT** » Sun Aug 08, 2021 7:13 pm

Thanks for your input will try your suggestions

Ian F · Post by **Ian F** » Mon Aug 09, 2021 8:03 am

Probably not provided much for you to go on Tom. Intermittent faults like this are always tricky. I suggest checking all the wiring connections. If it is just a sticky needle in the instrument you could look inside, but perhaps best left to a specialist to overhaul the unit.
Speedograph Richfield have done similar overhauls of instruments for me.

Ian F

TomMGBGT · Post by **TomMGBGT** » Sat Aug 28, 2021 12:45 pm

Thanks Ian,have sent the Unit for repair to instrument tech.

JohnH · Post by **JohnH** » Thu Sep 23, 2021 9:50 am

I always have had to tap the glass too. Needle stop perhaps magnetic?

Sean Lynam · Post by **Sean Lynam** » Sat Oct 30, 2021 10:19 am

Hi all, have a look at this site....
Tach issue with switch to electronic ignition : MGB & GT Forumhttps://www.mgexp.com › forum › tach-issue-with-swit.

MGB Register Forum

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