I have an 83.5 WBX Westy, Canadian edition that has a speedo plus
analogue clock for the instrument cluster.
The clock keeps great time but it is also NOISY and I presume can
slowly drain the battery if left parked for long periods.
So, I want to install a tach to replace it.

  Major problems:
1: The temp gauge is integrated into the clock.

2: I'd like a clean install. (Not an aftermarket, top of dash tach.)

Suggestions???