I've used a "Tiny Tach" to do mine before I got the Pro-One tach. I got mine on Ebay for $22 Its got an internal battery. You just wrap the lead around the spark plug wire and its ready to go. But at just $35 and its just a clamp on that sounds like a good deal.
2005 1100 Custom
ORKed 5/16" Lines
PODs K&N RU-600s W/PCV
PCS XXX/2 cams
Jetted & PMS Tweaked 20.0/152.5 3.0 turns
Wimmer Machine Custom Oil Cooler & Stash Tube
Dyna 3000 Step 5/ 6500 redline
6" Fwd Control Extension W/Boards F&R
Memphis Shades Bullet Fairing
Progressive 465 rear
Progressive Springs and GVE front
10,000 Monkeys throwing crap at the glass and this one thinks he's Picasso...