Bruce wrote:

As far as the instrument problem is concerned the logical plan would
be to undo the last thing done, i.e., disconnect the Tach and see what
happens?

Hardly rocket science but if only one thing changes - the bloke
connects a different tachometer - and all the instruments fail then

Which I will of course try today. Yesterday I tried switching the old tach
wires (see original post). That was a "no go" because the connectors allow
only one proper connection on the new instrument. Note that only the temp
gauge is acting up. All other gauges (oil, voltage, tach, alarms, lights,
etc.) perform properly.

--
Good luck and good sailing.
s/v Kerry Deare of Barnegat
http://home.comcast.net/~kerrydeare