How to DIY Fix Tachometer Solder Joints of Mazda RX-7′s
Sponsored LinksIf you find that your RX7′s tachometer performed a bouncing needle, the following article may give you insight in diy 
repairing your Mazda RX7′s tacho.
According to the article, the main fixing process will contain series of steps. There are replacing the capacitors, resoldered several connections, and then resoldered the surface-mounted components. You will find the basic procedures for removing the tachometer, tachometer needle, and reassemble the device.
Tools required for fixing the tacho are such 15/30 W dual heat-range soldering iron, solder wick of unsoldering connections, 1/32 inch diameter rosin-core solder, one sheet of notepad paper 4×5 inch. And parts needed are one 1uF 50V electrolytic capacitor and one 0.015uF 50V polyester capacitor preferably rated for 105C or higher.
See completely How to Fix Tachometer Solder Joints of Mazda RX-7′s in this diy RX7 tacho of pdf filetype (source: wrex-racing.com)
