Thanks for your response. It was a little bit different than described in diagram. The big difference is that it was removed "inwards", as opposed to being lifted out.
Here's how it went. Again, my skill level is low. Transferred current mileage with supplied cable - no problem. As stated earlier, existing speedo has to be removed inwards.
After removing dash undid 2 electrical connectors. Now released 3 large clips securing speedo to inside of dash housing. That released the speedo from dash. Now pushed speedo inward and had it in my hand. Removed secondary bracket and gasket from speedo. Installed this bracket and gasket on new speedo. Now snapped this assembly back into dash bracket , and reconnected electrical connectors.
Now the fun part. Trying to re-mount dash while holding gaskets on side in place.
Finally got everything in place, and tested. So far, so good..
Test ride tomorrow, and learn how to set desired lighting colors of new speedo.
Experience was a little stressful, but I got it done.
Mike M.