Installed a tach from a 1977 pantera 5000 f/a in to my 1978 pantera 5000 f/c sled. The problem is it reads 6 grand at idle. I know it is idling at 1000 +/- (it is oblong oval shaped tach) it only plugs into the wiring harness for the lighting system, the plug runs both the lights to read the tach at night and give the tach its power. I did not notice any type of voltage rectifier on the donor sled.
At the touch of the throttle, it instantly reads 10000 rpm, adjusting the adjustment screw on the underside of the tach does nothing. I inspected the donor sled and found almost all the wires leading from the voltage regulator were grounded out on the chassis. Would this cause damage to the tach? or maybe the sled are incompatible? Thanks any feed back is welcomed, jim
The tach's are not interchangeable on these models. Your fan cooled requires a mechanical tach that is driven by a speedometer type cable connected to the center of the recoil. You see them on eBay occasionally but are getting rare. A used one will work from any model cat that used that setup. I recall jag's had a mechanical tach.
Thanks for the information, I guess I need more parts then what I thought, I do see a hole along the recoil case about 5/8" I can see the cup the dogs catch on, is that the place or maybe I need a recoil that will adapt? thank again
Originally posted by jbidlack@Nov 27 2004, 10:25 PM Thanks for the information, I guess I need more parts then what I thought, I do see a hole along the recoil case about 5/8" I can see the cup the dogs catch on,* is that the place or maybe I need a recoil that will adapt? thank again
Your recoil is the correct one, when you find a kit, a right angle gear drive that is similar to the speedometer drive will bolt up to that center hole in your recoil. You also need to tap an insert in the end of the crankshaft (remove recoil) and insert a short square speedometer type cable. I dont think these are available from Cat anymore, you need to watch eBay. A mechanical drive from any model cat will work.
If you don't care what the tach looks like or how it fits in the dash, an electric tach from another brand of sled will work too. The key is both sleds need to have the same number of alternator poles under the flywheel. Not sure waht that number is but when I get time I can figure it out. Check your local Cat dealer, that will happen much quicker.
Thanks for the information, I got lucky searching the www and located both a mechanical tach and temp gauges. Both are new complete kits that have been sitting on a shelf sense new... I'll look for the web sight and post it, they have early to mid 70's on up in used parts a lot of wild cat parts...