TL RPM

What do you get when you add 22 year old VDO tach, 50 year old Type3 gas gauge, angle grinder (ofcourse) and duct tape? It's tach for the TL and a bunch of left over parts! I bought used accessory tach for 48 euros and butchered a red needle '62 gas gauge (with hesitation, but it was broken anyway). Now I'm able too see if the TL is running on idle or not at the trafic lights, as that's how quietly stock Type3s roll baby.