Here’s a shot of the Signet System 4000 instruments package which I finally removed. I can’t find anything out about this on the internet. The big black box was mounted on the electrical panel, the remaining hole is approximately 12”x8”! Did I mention the “display” feature on this 12”x8” are those four red single digit displays (about 1”x2”). At one time there were depth, wind and knot meters. When I purchased the boat only the wind and knot meters were operational. I pulled out all of the wiring and the head unit. I also think at some point there was a pedestal mounted display of some kind because I also pulled a wire labeled display out from under the cockpit that ran up into the pedestal.
I’m going to jury rig the Maretron DSM250 into that huge hole and at some point replace the entire wood panel holding all of the electrical and electronics.