Gauge

Engine is what I meant. And the last tune up was 17 months ago.

I own a 2001 Subaru Outback (manual) with roughly 150,000 miles on it. Excellent maintenance record, I take pride in my vehicles. Here is my dilemma: For the past two weeks my transmission has been idling too high or low enough that it barely keeps from stalling (but not every time I turn on the car). More over, when I shift from any gear to the next, be it up or down, the rpms hang high for 2-3 sec. before returning to a proper rate. Additionally, after shifting gears, the transmission takes a second to catch entirely. Normally I would take it that my transmission is going but doesn't act this way every time I drive. I've driven with the radio off and experimented/adjusted shifting repeatedly. I also replaced the differential fluid about 2 months ago. Any insight would be very useful! Thanks