Look up SenDec on Yahoo and you will find multiple sources for SenDec Corporation hour meter/tachometer devices. Even a number of Yamaha generator sources sell the SenDec hour meter. I installed one on my Yamaha 3000iSEB generator just after I got it and it works great. All you have to do is roll the end of the wire attached to the meter around the spark plug wire going to the spark plug. The meter has a peel and stick backing so that you can mount it to the generator where you want it.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system