Tacho spins light parade and full failure

Moin people. My transe spins…On the 30th he didn’t want to jump on. So ADAC got it and start help. The yellow one tells me battery weakens. He also noticed that the battery light and the mkl hooked briefly after the start. Then he knocked on the tacho and everything was back to the old one. According to his statement I had a wackler in the tacho. At the fors nothing new he said. What he didn’t tell me was that I should absolutely go to the workshop. So I left on the 31st night… .naja New Year’s Eve party halt. Anyway after 30 km I noticed like on drive the km counter for the trips and so on dashed line jumped and at the same time my engine took no more gas. So I did it like the yellow and knocked. That happened then constantly. Then he went out in the middle of the ride and all the lamps lit. I rolled to the edge, took off the ignition and started again. He went to abs and it lit up. Then I kicked the clutch and he went out again. g 2 or 3 times and since then he doesn’t jump on even though he wants….I thought now either tacho out and control or vss at the gear? What do you say? And the tacho looks crass. Do you have tips like I should solve it best? Thanks people…..Transit mk6 09.2008 2.4 diesel