You can check it against an external tach/dwell meter.
Some timing lights also have an integral tach.
Or, if you're really good at counting, count how many times the timing
mark goes past in 15 seconds and multiply by 4. :-)
On 2025-08-11 17:15, dave northrup wrote:
> Sorry. The needle moves and it is working.
>
> My apologies- is there a way to verify its accuracy?
>
> -------- Original message --------
> From: Max Heim <mvheim@sonic.net>
> Date: 8/11/25 6:31 PM (GMT-06:00)
> To: dave northrup <dave@ranteer.com>
> Cc: mgs@autox.team.net
> Subject: Re: [Mgs] 58 MGA with early 5 main MGB engine
>
> Um, youâ??re the one in a position to tell us if it works or not. What
> are you asking?
>
> Does the needle move when you fire the engine? What does it read at
> idle? Are you asking if itâ??s accurate?
>
> --
> Max Heim
> mvheim@sonic.net
>
>> On Aug 11, 2025, at 2:38â?¯PM, dave northrup <dave@ranteer.com>
>> wrote:
>>
>> Is there a way to tell if the electric tach is working on this
>> engine (early 5 main MGB engine)
>> _______________________________________________
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Larry Colen LRC@red4est.com http://red4est.com/lrc
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