Hello,
I am trying to find compatibility and wiring instructions for the vintage airguide tachometers with 50s OMC motors. the 56 and 57 30s and 35s.
The only source that I had found for documentation looks to have closed down, classicboatworks.com.
I couple of years ago I purchased what I thought was a 653 with sending unit and put it on a shelf. The wire connection label is missing from the sending unit and I dont want to destroy it guessing.
Is there a resident expert or someone that has a set of instructions they would be willing to share? Maybe a pictures of the label on a 4 wire sender.
I have exclusively 1950s OMC motors but this particular application will be for a 1957 evinrude 35.
I am attaching pictures of what I have now. The sender has 4 wires at the back. Black, green, white, and maybe an off white. The Tach has 2 wires and 2 terminals, I assume light and tach.
Can anyone positively identify this tach, is it really a 653? Is the sender the correct sender? I saw a post showing another 653 but it had a 5 wire sender.
If this is the wrong one, what are the identifying features of the 653? Most of the ones I see for sale are just called out as “airguide tachometer” without a model number.
Lastly, I know that the senders are getting rare. A few folks have mentioned efforts to reverse engineer them. Has anyone had any success yet?
.
