Electronic Tach frozen in polar region

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Bear with me on this...when returning from the International Rally in August the ignition warning light came on on my MK III. This was not a major issue, ferry only 50 miles away & I easily made it home to Lincolnshire, on checking the voltage it appeared to be above 13V & I put it down to the intermittent issue I've had with my assimilator for the past 17 years (replacement in garage, my own NOS).

Been out for a couple of rides since then, nice bright red iwl, hah crappy assimilator! Last Saturday was unseasonably warm & time available, so off for a blast - on the return journey I discovered that the assimilator was err, working. The battery died & the boyer went haywire. I managed to get off the narrow, ditched fen road & sat in the sun awaiting collection by FJ at a (sadly closed) pub.

Battery is recharged & ready to be put back so I can trace the problem (I'm sure further posts will follow ;-) alternator?) So, to my question, my electronic tach needle is currently stuck, frozen north of 7k rpm, how do I get it back to zero, just switch on? Or will it sweep to about 5k & reset back to where it started in the 'polar' region?. Or is it (in the vernacular) fecked! (boyer massively advanced due to low voltage & pipes blued in +/- 1/2 mile)?

Cheers, Mike

Ah yes, useful info for you if in a similar position: I got 155 miles from my MotBatt battery which (I'm guessing) was running at total loss between 28 Aug and 15 Oct (no lights, satnav used, 3 or 4 electric starts & garaged) when fully discharged. No problems starting in that time until our ignominious return.
 
Sadly the assimilator only tells you that AC is being generated by your alternator. It doesn't tell you if it's being rectified to DC or if your zener diode or voltage regulator is keeping it at the correct value.

Dump it and stick one of these in the indicator light hole. It gives way more information!

http://www.sparkbright.co.uk/sparkright-eclipse-battery-voltage-monitor.php

After having my Boyer act up on low voltage and taking out the starter sprag I dumped it for a Pazon.
 
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