ANDREW - Great news about your 147. I've been following your progress on some other forums. Don't worry about mentioning your Other tractor, I noticed the last day or two some people were mentioning Other tractor brands on that other site a L-O-T, even though I didn't particularly like what they were saying. I thought I got away from all that BS over 20 yrs ago when I moved away from Moline, IL.
Yep, a Hydro CC & snow blower makes a good snow moving machine.
I've got hour meters on two of my 3 CC's and a engine driven (mechanical) tach, hour meter, & speedometer on my Super H, and will add another tach/hour meter to the M eventually, it's not hard with 400/450 Farmall parts. And the CC 70 will get an hour meter & tach as well.
The tachs on the CC's will come from Dave Kirk. I've shopped for tachs for CC's for over 30 yrs and dozens of different mfg's and the ones Dave offers are exactly what's needed.
Your correct, the hour meter can go anywhere, you only have to look at it occasionally to keep track of maintenance. The tach has to be constantly visible. It might fit in the dash in a hole cut into the panel but I was thinking of making a bolt-on box for mine, something bolted on down by the frame & base of the steering console/colume. I'd like to fit a couple other gauges into it as well, like cyl head & oil temp, I'd like EGT also but not sure how well that would work on a single cyl engine.
Now that you've got your 147 running good it's time to start customizing/restoring it! Far as the wiring harness, you could make your own, I would NOT buy a used one, only if it was NOS, never installed. By the time you buy all the different sizes & colors of wire, and connectors, and convoluted conduit or other wrapping, I think it would be almost cheaper to BUY one custom made. They are available.