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If you want a CHEAP tach just for a short time use for engine diagostics etc. you can often use the old tach / dwell meters that are out there at garage sales, ebay, etc. Just two wire clips to coil and gnd and you can hang it from the dash rail.
Here is an example of what I am taking about.
http://www.ebay.com/itm/Vintage-Sear...f9d7e6&vxp=mtr