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First about the speedometer and related gears. The last time I drove the car (~120km trip to drag racing event) the speedometer was working almost from the beginning , but maybe that was temporary state. Next week I will have longer journey to my home town (for rally event) and back, so then will see if it will work constantly and also will make some tests with the boost meter . I bought the above mentioned gear mounted on the differential. So the differential will be removed and (probably) worn gear will be replaced with new one. And that have to solve the problem with speedometer, hopefully. I have one fear that recently installed gear with sensor (red piece on the picture with sensor in the previous post) can be damage by gear on the differential. The gear which I bought was in stock (for my and seller surprise), but other gear on the sensor is not available in stock . So maybe will have to check on other dealers. Will be good the sensor and gear attached to it to be removed (without damage) and if it is in the condition before installation removing of the differential can be done, if not new one will have to be bought. Next point is boost sensor. The vacuum for the sensor was get from pipe between plenum and bosch dump valve (like I wanted). But I saw that original pipes don't seal T-piece. The air can be hear with engine running and the pipes can be removed very easily. The solution was old original pipe (now two pipes) to be replaced with aftermarket vacuum pipe. On the bellow picture is the original pipe. You can see the cracks when mounting it to the T-piece. I wanted fast solution and bought SFS performance vacuum pipe form nearest performance shop to me. As you can see from the next picture it was in the only one available color - blue (the pipes that comes with the gauge is transparent and go from T-piece to the pressure sensor). I bought it with internal diameter of 4 mm and original one looks the same. I'm not fan of colored pipes (blue,red and so on) so probably in the future will be ordered black Samco Sport pipes. And here is the picture of the installed gauge on the dash. I'm not fan of cutting and drilling of original equipment and because of that I decide to install it with the stand in the package and to stick it to the dash with 3M two side tapes (also in the package). And the things that are not just right. First like you can see in the second picture of the gauge it don't show exact 0 when the car is off. Second is that at idle it shows only around -0.4 (thats on cold engine, on warm up it has to be a little more). For maximum boost I have test only on second gear with old original leaking pipe. By my mechanic the stock bosch dump valve is broken and that will not be uncommon for so old diaphragm valve. So still to come tests of maximum boost and with installing of forge blow off. Another very long post of me . Hopefully interesting for these of you which read it all and don't give up at some moment . P.S. I'm waiting for my turn at my friend who makes exhaust systems .