Service Spares Letter 406 – [Piper quote] “PURPOSE: We are pleased to announce that we now have the capability to replace most all of the out of production Stewart Warner and A.C. Spark Plug Company indicating systems with Rochester gauges.” [end Piper quote]. This is a great reference and will help many. Read specifically pages 3 through 5 which concerns the Comanche gauges: CHT, oil temp, oil pressure, fuel quantity, ammeter. This includes the panel gauge units and the sender units. You may not be real thrilled with Piper’s pricing!
Autopilot trim switch repairs. Also see the Rams Horn Yokes link.