T&T: Hour Meter

[Frank Burrows]

Joel:

Some setups use a pressure switch after the fuel pump that sense 10 psi. 
When the engine is running the switch closes and completes a circuit to the 
meter. You could also use oil pressure to accomplish the same thing. 
Remember that for this application you want a Normally Open switch.

Here is a site that shows the meters and the switches:
http://content.honeywell.com/sensing/hss/hobbscorp/cat1_hr10.asp


Frank Burrows     Destiny   1979  43'  Viking MY
      Piney Narrows     Chesapeake Bay