What is happening to my Auto trans????

[TURBOTAXI]

My turbo AU blew a little heater hose today (one of the LPG convertor ones), naturally the heat shot right up. I stopped over a dip on the shoulder to get under the car and using some of my high quality bush mechanics skills used a 5c peice to undo the hose clamp them used a broken bottle to sever the old hose and then just reattached the lot.

Then I got some water and refilled the radiator (but I couldnt fully refil it) so I left the cap off and drove a bit further. The car boiled again so I stopped again. I got more water and went again while I was driving some strange things happened all at once.

1. The speedo stopped reading
2. the car shifted from 4th gear to 3rd gear and would not go back to 4th
3. The car now seems to start off in second gear

All of this while drive is selected. My trans is out of an EB for those that didnt know.

So it seems to me that these issues relate to an electrical issue, but I dont know exactly what the issue is.

I seem to remember a thread where this issue (or similar) was raised.

Help please.