With the tips and tricks from this forum I was able to pull out the instrument cluster fine. I used a 13mm open wrench to hold the oil pressure body steady and a 10mm open wrench to disconnect the line. The speedo cable connector can be turned by hand. I replaced all the bulbs, a drop of oil in the speedo cable, wiped clean all connections and labels (pulls out from the side) fine. The rheostat has been bypassed. Unfortunately I have to go back in there again once I get the part to install a bulb holder for the reserve fuel indicator, which is missing. The last man who fiddled around with it lost it and did not tell!

The reinstall is the reversed but had some trouble with speedo cable not having enough slack. A light thug on the cable gave me about 1 inch of slack enough to reconnect it. Will see if I performed the job correctly when I drive it tomorrow.