Wig Wag gear indicators.

[Kevin Harberg]

                                                                                                 Wig Wag Gear Indicators Mooney M-18

 

The Wig Wag on the left is made by:                                                                                            The Wig Wag on the right is made by:

        The Anderson Co. Gary, Ind                                                                                                                         TRICO

     ANCO (Maxi Vac Model MV 1B)

                    ¼” hose fitting                                                                                                                          3/16” hose fitting

 

One of these units is likely off of my M-18LA serial number 142 and the other is likely off of my M-18C serial number 306. Curious if manifold pressure differences

between the 145cu in Lycoming (0-145) and the 170cu in Continental (CA65) require different vacuum units or if changes were made on the production line due to

availability. My M-18 drawings only show the TRICO unit for both “L” and “C” models. 

Is anyone familiar with these gear warning indicators? I don’t know which one goes with which airplane.