tach adaptor question

hi, im in the market for a tach adaptor. i was looking around and found a new sunpro one for $15 and one from rksports which is $33, i was basically wondering which one YOU would get, and why? thanks

a tach adaptor is a tach adaptor. Of you can get the autometer one for 60 bucks if you have deep pockets. Oh and Sunpro is crap in my opinion. Mechanical tachs are not very accurate. You want a full sweep electrical.