Buck - If you are not a stickler for originality the cheapest is to replace the magneto kill switch with a DPDT toggle switch.
Wire one side of the switch to ground the magneto when the switch toggle is pointed down (your ignition "off" position). Wire the other side of the switch between the ammeter to the hourmeter so it supplies 12 volts to the hourmeter when the switch is "on".
Alternatively you can install an N.O. (normally open) pressure switch on the engine. Connect one side of the switch to the ammeter and the other to your hourmeter.
Key here is to get an N.O. pressure switch! Keep in mind most automotive oil pressure switches are N.C. (normally closed) - their contacts OPEN on sensing oil pressure.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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