[6pack] Voltage Stabilizer Questions

[Yahoo]

Hi there.
My fuel and temp gauges weren't moving so I put in a new voltage stabilizer I had on the shelf from sometime in the past. It came in a blue  box marked British Spares. The gauges read now, but the readings are very high compared to before, so problematic.  I laid on my back with the engine running and tried to probe the stabilizer with a multimeter, but didn't get anywhere.   I can try this again setting myself up better if you can test it this way.  I understand the stabilizer's function is to reduce battery voltage down to 10v  for the gauges, so I presume you should see 10V on the I side.  Masters' electrical book says its not so simple to test stabilizers.
I presume I need to find and install  a different stabilizer?
I've heard there's issues with the solid state stabilizers Moss/BPNW.sell.   Not sure if Moss has rectified the issue.   The Rimmer Bros catalog shows one with Caerbont Automotive written on it.  Caerbont seems to be the manufacturer of  Smiths instruments nowadays.   Not sure which one TRF sells, but they're on backorder there anyway.   
Not fond of working under the dash, but a repeat of a recent job normally goes smoother.
Thank you for your advice,
Cheers,  Bruce Simms 73 TR6
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