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An every day MSD window switch should be fine. The only downfall is the price. $76 for the switch, and then $21 for each RPM pill package which you will need 2 of. I think NOS has one for like $175. :eek:
Best bang for the buck is the Mallory window switch. I think they sell for $95 now adays and they use switches in the box as opposed to the pills. I bought one when they were only $75 ;). Programmable from 0 rpm to over 9K (I think) in 100 RPM increments for both on and off RPMs.
Here is a picture of mine. Very easy to adjust on the fly too.
I am sure the Harlan is a quality unit and for $50 a great price. It does take a little more effort to adjust the ranges using his method though and you have to keep the "key" that tells you what pins to turn on and off for the adjustments. Not too big of deal though for 45% savings.