Quote Originally Posted by Vagabondblues View Post
The old 3 in 1 and 4 in 1 systems were installed on Piper twins Apache, Aztec... by Norwich, I think... Today they are RC Allen units. The 4 in 1 with fuel pressure was for fuel injected engines which usually tapped into the fuel bypass valve on the engine driven pump. That way you could see the boost pump pressure when it was on and the engine was not turning. After start the engine driven pump supplied the pressure to the unit.
Sorry, I should have noted sarcasm on my comments regarding the fuel pressure not working on the Pacer. It was an attempt at a joke.

Regarding the Alcor rotary switch, that is very interesting, and I will talk to my mechanic to see what he thinks about that. I would really like to have information from more than one cylinder.