Just got a stage 1 JET chip for my 1989 TPI 350 and per instructions, it requires the stock chip to be piggy backed on it. Is this correct?

Who has installed a JET chip on a TPI without problems? It's difficult to install because of limited space around the socket. The Hypertech on my other car (RS TBI) didn't require the old stock chip to be incorporated along with the old.

I know off the shelves chips are not worth it but snagged one at $50 and just couldn't resist.

 

You very well may need to cut the window open larger to have the space to use it.

 

I have a stage 2 and it fit fine...

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91 z28 lb9 5 speed - hooker 1 5/8 headers - high flow cat- full 3 inch exhaust - home made ram air - tpis airfoil - dual chamber flowmaster - Stage 2 Jet Chip and 160 stat - 8 mm Msd plug wires - 55,000 v hypertech coil/rotor/distrib. cap - Mac. White face gauges - lots of sound system crap...

 

I use that piggy back adapter for my own custom proms and I just bent up the aluminum case a little to make it easier to get in and out.