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Installation of a sunpro super tach ii on my 1981 camaro 4 wires green tach red power black ground white light before wiring make sure the tach is set to correct engine setting of 8 6 . The swap meet section or ebay for a factory tach if it has the long orange needle and there is no redline markings below 4500 rpm it the correct tach for your 80z lower redline means its a v6 tach shorter red needle means its pre 79 the proper replacement should look like this. 7000 rpm with 5000 rpm redline a camaro replacement tachometer may be required when the tachometer on your 1970 1978 camaro gives out the tachometer is the instrument responsible for measuring rotational speed of the engine in revolutions per minute or rpm this instrument works by reading a signal from the negative side of the coil if someone mixes up the wiring the device can fry and