For my timing belt tension, I used a 2-pin spanner into the cam gear holes. Mine is 1 foot long. Left side you will pull from the underside outwards, right side from the top outwards. Using a luggage scale and a ratchet strap tied to a tree or other solid object you can pull at a right angle to the spanner to pull the proper tension on the cam sprockets. I didn't have a luggage scale, so I just put 17-19lb of water or rocks in a bucket over a pulley. Voilla- 19 lbs at 1 foot with no special tools. I initially did the Miles "close enough" hand tensions but I don't trust that, belt was flapping around too loose for my liking. Also, after checking my spark timing it was off, so I realized I was off 1 tooth on the crank sprocket. Because of the 1:2 ratio, it can be hard to notice that small difference. Re-check the spark timing because old stretched belts can cause it to be off compared to new belts and tensioners. Another mistake I made was to replace the 2 crank pulleys inverted which made the LH belt track too far inboard. Pushed the inner flange off the oil pump sprocket. JB weld has held so far. They're tough to tell the difference. +1 for open covers, I would have not been able to make these adjustments after the fact with them on. Timing belt is part of my normal weekly maintenance check now.