When you engage the Jake while coasting the turbo boost will drop to zero
Ah, excuse me Mr. Wornborg, this is not correct! I checked today and my statement about getting boost on the gauge while using the jake is correct. I get 1 - 4 lbs boost when using the jake depending on RPM and when the jake is shut off, boost goes to "0". I remember the series 60 doing the same thing.
It's OK to admit your wrong, it builds character!