rpm checking devices

[moline ub special]

was wondering where i could get one of those guns they use to check rpm at pulls it hooks to a plug wire thanks

 

[Bouncer]

I bought one off eBay for around $50. It will check two and four stroke engines, and 1,2,4,6,or 8 cylinders. It has a dual rpm range and will go up to 10k rpm. I have checked it against the more expensive one the local club uses, and it was within 10rpm.

 

[matt bock]

I bought a digital photo tach on ebay for 30 bucks. It will do diesel and gas u put a sticker on the crankpulley it works good.