the above pictured tach is the works connection tach. I received one attached to a saw I bought off Matt, not sure if he attached it or someone else did. I thought it was a bit of a gimmick, but it sure did make tuning a snap. I used to tune all my saws with a hand held tach, but it got hard to find the time to do it. I live in a residential area, and I dont get home till late. Most people don't appreciate the sound of a dozen muff modded chainsaws being started up and run at the redline consecutively on a weekend.
It never bothered me for a while, but a few months ago I had an issue. one of my 044's was running lean and I knew it. I'd pull it out, start it up, realise it was running way too fast then put it aside, thinking I'd tune it on the weekend. Weekend would come and I wouldn't want to piss the neighbours off. Or I'd forget.... Anyway, one day the inevitable happened. Big take down, all the saws were run and blunted pretty much every chain. I was off dumping and one of the guys ran that 044 and lean seized it. I ordered a box of the works connection tachs and fitted one to each of my saws, the pole saw, and even the blowers. Stump grinder came with one attached already.
I can tune them all on the job now, and I'll admit the hour meter is a bit of a novelty. It's interesting to see how many hours the saws rack up each week. I was surprised how many hours I'm putting on my climbing saws (a lot!) and how few hours the bigger saws rack up. If you were anal you could use this as the basis for your servicing, or keep stats on how much fuel, oil, chains etc you use per hour. I don't have time for stuff like that. Its just nice to know I'll not be lean seizing a saw again.
Shaun