You guys are wrong ! Upgrade was easy. I used a 100mm paper form I measured and made to relocate and enlarge the holes for the speedometer and tachometer. I then used the paper hole that was aprox. 105mm that came with the gauge to mark the hole position then used a dremel tool with a drum sanding disc to follow the marks.Quick , but dirty. I wouldn’t try it with a leather covered dash , no problem with vinal . I didn’t pull the dash or steering wheel. I spent no more than 3 hours total start to finish. Only downside is that it was messy. The smaller gauges are slightly smaller in diameter , but work fine. I’ll post pictures ! BIG THANKS TO ROCKBIT FOR HIS MEASUREMENTS FROM HIS ERA WITH SMITHS GAUGES. I WAS ABLE TO GET TO LESS THAN A .25 INCH FOR THE TACH AND EXACTLY THE SAME ON THE SPEEDO.
